Disable Taskbar Thumbnail Previews in Windows 11 & 10

The short version: one registry value, ExtendedUIHoverTime, controls how long you have to hover over a taskbar icon before Windows shows the live thumbnail preview — and that's true on both Windows 11 and Windows 10. Here's the part almost nobody says out loud, though: there is no setting anywhere in Windows, on either version, that actually turns thumbnail previews off. This registry trick, the one our own site and half the internet has been recommending since 2016, only delays them. Set it high enough and it feels disabled. It never actually is.

Jake called me on a Tuesday afternoon sounding like he wanted to throw the laptop across the shop. A customer had brought in an old Dell for a slow-startup fix — nothing dramatic, just cleanup work Jake does a dozen times a month. While he was clicking around to show her what he'd found, he hovered over an icon in the taskbar to check something, and up popped a thumbnail from an app she'd left open: a video call, her face frozen mid-sentence, from a conversation she clearly hadn't meant for anyone else to see. She went quiet, grabbed the laptop back sooner than planned, and left a two-star review that afternoon calling the shop "unprofessional." Jake didn't do anything wrong on purpose. Windows just showed him something it had no business showing, the second his mouse passed over the taskbar.

That's the actual reason this fix matters, and it's a better reason than most people give. It's not really about performance or clutter — it's about a screen showing something the person standing next to it didn't choose to show. This guide covers the one method Windows actually gives you for it, on Windows 11 and Windows 10, exactly what it does and doesn't do, where people get the value wrong, and what to do instead if a delay isn't enough for what you need.

What ExtendedUIHoverTime Actually Does

Regedit is short for Registry Editor, the built-in Windows tool for reading and changing the settings database that almost every part of Windows quietly reads from. You get to it by pressing the Windows key and R together, which opens the Run box — a small text field for launching a program by typing its name instead of hunting for an icon — then typing regedit and pressing Enter.

Inside, ExtendedUIHoverTime is a DWORD, which just means a 32-bit number value, sitting in the Explorer settings for your Windows account. By default, hovering your mouse over any taskbar icon shows a thumbnail almost instantly — a fraction of a second, not long enough to move your mouse away in time if you didn't want to see it. This value overrides that gap and makes Windows wait however many milliseconds you specify before the preview appears.

That's the entire mechanism. It's a timer, not a switch. There's no companion setting, no checkbox in Settings, and as far as we can find, no Group Policy entry for this specific behavior — which is unusual, since Microsoft puts a policy on almost everything else in Explorer. If your PC is a Pro or Enterprise edition, you might expect Local Group Policy Editor to have something for this. It doesn't. Registry or nothing, on every edition.

One correction to our own original post, stated once: the registry path we gave in 2016 started with HKEY_LOCAL_USER. That hive doesn't exist in Windows — it never has. The correct one, and the one you actually need to type, is HKEY_CURRENT_USER. If you copied our original path and it didn't work, that's why.

How to Delay Taskbar Thumbnail Previews in Windows 11

These are the exact same steps as Windows 10 — Microsoft didn't touch this part of Explorer when it redesigned the Start menu and taskbar for Windows 11. If you're on Windows 10, you can skip straight to the Windows 10 section below; it's identical, just written out again so you don't have to scroll back and forth.

Step-by-step

1. Press Win + R to open the Run box.
2. Type regedit and press Enter. Click Yes if Windows asks for permission — Registry Editor needs administrator rights to open, even though this particular change only affects your own account.
3. In the address bar at the top of Registry Editor (or by expanding the folders on the left), go to:
   HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced
4. With Advanced selected on the left, right-click anywhere in the empty space on the right-hand pane.
5. Choose New, then DWORD (32-bit) Value. Yes, 32-bit is correct even if you're running the 64-bit version of Windows 11 — this is a UI timer value, not something tied to your processor architecture.
6. Name it exactly ExtendedUIHoverTime, with no spaces and matching that capitalization. Registry value names aren't case-sensitive in how Windows reads them, but typing it exactly avoids any confusion if you ever search for it again.
7. Double-click the new value. In the Edit DWORD box, click the Decimal radio button first, before typing anything — Registry Editor defaults to Hexadecimal, and typing a decimal number while Hex is still selected gives you a completely different result than the one you intended.
8. Enter your delay in milliseconds. 1000 is one second. For most people, somewhere between 3000 (3 seconds) and 6000 (6 seconds) is long enough that an accidental hover won't trigger it, without making the taskbar feel broken if you do want to check a preview on purpose.
9. Click OK, close Registry Editor, and sign out and back in (or restart) so Explorer picks up the change. It will not apply instantly to icons you're already hovering near.

How to Delay Taskbar Thumbnail Previews in Windows 10

Same registry path, same value name, same steps as above — here it is as a checklist:

1. Open regedit (Win + R, type regedit, Enter).
2. Go to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced.
3. Create a new DWORD (32-bit) Value named ExtendedUIHoverTime.
4. Double-click it, switch the base to Decimal first, then enter your delay in milliseconds.
5. Sign out and back in for it to take effect.

One honest note if you're still running Windows 10: support for it ended on October 14, 2025, so it no longer receives free security updates unless you've enrolled the device in Extended Security Updates. This registry tweak will keep working regardless — it's a local Explorer setting, not something tied to update status — but if your PC meets the hardware requirements for Windows 11, that's a bigger thing to sort out than taskbar previews.

How to Revert It, or Get as Close to "Disabled" as Possible

To go back to the default near-instant preview, either double-click ExtendedUIHoverTime and set it back to 0, or right-click it and choose Delete. Both remove the delay entirely — 0 doesn't mean "off," it means "no wait at all," which is actually the opposite of what a lot of people assume when they read instructions telling them to set it to zero to disable the feature. Deleting the value is cleaner if you don't want a leftover entry sitting in your registry.

And to say it plainly one more time: there is no value, and no separate setting anywhere in Windows 11 or Windows 10, that makes thumbnail previews never appear under any circumstance. The highest practical value — something like 3600000 for an hour — is the honest ceiling. It's not disabled. It's just delayed long enough that, in ordinary use, it might as well be.

When It Doesn't Work: The Failure Modes

The delay seems way longer, or way shorter, than the number you typed. This is almost always the Decimal versus Hexadecimal mix-up. If you type 40000 while the Hexadecimal radio button is still selected, Windows reads that as the hexadecimal number 40000, which converts to 262,144 in decimal — over four minutes, not 40 seconds. Open the value again, check which radio button is selected, switch to Decimal, and re-enter the number.

Nothing changed at all after you clicked OK. Explorer reads this setting when it starts, not continuously. Sign out and back in, or open Task Manager, find Windows Explorer in the list, and restart it from there instead of a full reboot if you'd rather not close everything else.

It worked on one account but not another. This value lives under HKEY_CURRENT_USER, which is specific to whichever Windows account is signed in. If a shop PC or family computer has more than one user account, each one needs the value set separately.

What This Setting Doesn't Touch

This is where most people who set this value get an unpleasant surprise later, so it's worth being explicit. ExtendedUIHoverTime only affects the taskbar hover preview. It does not touch:

Alt+Tab. Holding Alt and pressing Tab still shows full-size previews of every open window instantly, with no delay, regardless of what you've set this value to. If your privacy concern is someone seeing open windows while switching between apps, this fix does nothing for that.

Jump lists. Right-clicking a taskbar icon still shows its jump list — the menu of recent files and pinned shortcuts for that app — instantly. That's a different piece of Explorer with its own settings under Start rather than under Advanced.

Task View and Snap layouts. Both still work exactly as before; neither reads this value at all.

If your actual goal is stopping anyone who walks past from seeing what's open at a glance, in any form, this one tweak is a partial answer at best. It closes the accidental-hover door and leaves the others open.

The Privacy Angle: Why This Matters More on a Shared or Shop PC

Ethan's take on this one is pretty blunt: "If a machine is going to have a stranger's eyes on it — a customer, a walk-in, someone at a counter — you don't wait for something embarrassing to happen once before you fix it. You set the delay high before the first customer ever touches the keyboard." That's the difference between Jake's situation before and after that Tuesday. He'd never thought about it because it had never gone wrong. It only takes once.

For a shop like Jake's, the setup takes about two minutes per machine: set ExtendedUIHoverTime to something like 1,800,000 (30 minutes) or higher on any PC customers might stand near, and consider a fast user-switch to a separate limited account for customer-facing use if the machine also holds business data. It's a small, unglamorous fix, but it's the kind of thing that prevents the exact review Jake got, and it costs nothing beyond the two minutes.

If privacy is the actual goal rather than convenience, it's also worth glancing at what programs you leave open on a machine other people will be near — email, messaging apps, anything with account balances or personal photos. This registry tweak reduces one specific way that content leaks into view. It was never going to be the whole answer, and no single setting is.

Do You Need a Third-Party Tool?

There are taskbar customization utilities that hook deeper into Explorer than this one registry value can reach, and some of them expose more granular controls over taskbar behavior generally. For this specific problem, though, they're overkill. You'd be installing a background process with system-level hooks into Explorer to solve something a single DWORD value already solves in two minutes, with nothing extra running afterward and nothing to keep updated. Save the third-party tools for jobs this registry value genuinely can't do — this isn't one of them.

Remote Desktop, Virtual Machines, and Touch Devices

A few setups behave a little differently, and they're worth covering on their own since none of them are the plain desktop-with-a-mouse case above.

Remote Desktop. If you're connecting into a Windows 11 or Windows 10 machine over Remote Desktop, ExtendedUIHoverTime still applies — it's read from the registry of the account you're signed into on the remote machine, not the one sitting in front of you. Set it on the remote PC itself, under that account, the same way as above. Setting it on your local machine does nothing for what you see once you're inside the remote session.

Virtual machines. A VM running Windows 11 or Windows 10 — in Hyper-V, VirtualBox, or similar — is just another full Windows installation as far as this registry key is concerned. Open regedit inside the VM, not on the host machine, and set the value there. If you're running the VM in a window on your host's desktop, the host's own taskbar and the VM's taskbar are two separate things with two separate settings.

Touch and tablet devices. On a touchscreen without a mouse, there's no hover in the first place, so ExtendedUIHoverTime has nothing to act on — touching a taskbar icon opens the app directly rather than previewing it. This setting matters for keyboard-and-mouse use; it's a non-issue on a pure tablet setup.

Laptops with no external mouse. A trackpad still triggers hover the same way a mouse does, so everything above applies exactly as written. The only practical difference is that an accidental hover from resting a finger on the trackpad is arguably more likely than with a mouse, which is another reason to lean toward the longer end of the delay range on a laptop that other people might pick up or lean over.

Frequently Asked Questions

Does this stop Alt+Tab from showing previews too?

No. Alt+Tab reads its previews separately and instantly, no matter what you've set ExtendedUIHoverTime to. It only affects the preview you get from hovering the mouse over a taskbar icon.

Do I need to sign out or restart for the change to take effect?

Yes. Explorer reads this value when it starts up, not while it's running. Signing out and back in, or restarting the Windows Explorer process from Task Manager, is enough — a full reboot isn't required.

Why did my delay turn out way longer than the number I typed?

You almost certainly entered the number while the Hexadecimal radio button was still selected in the Edit DWORD box. Reopen the value, switch to Decimal, and type the number again.

Is there a way to do this without touching the registry?

Not currently. There's no Settings toggle and no Group Policy entry for this specific behavior on either Windows 11 or Windows 10, on any edition. The registry value is the only lever Microsoft provides.

Will this slow down my PC or use more memory?

No. It's a single timing value read once when Explorer starts. It has no measurable effect on performance either way.

Does this work the same way in Windows 11 as Windows 10?

Yes. Same registry path, same value name, same behavior. Microsoft didn't change this part of Explorer between the two.

What's the difference between this and turning off "Peek"?

Peek, the "Use Peek to preview the desktop" option in Windows, controls what happens when you hover the small button at the far right of the taskbar to glance at your desktop. It's a different feature entirely from taskbar app thumbnails and isn't affected by ExtendedUIHoverTime.

Can I set a different delay for different apps?

No. ExtendedUIHoverTime is one global value per Windows account. It applies the same delay to every taskbar icon; there's no per-app version of this setting.

Does setting it to 0 really turn previews off?

No, and this trips people up constantly. Zero means no delay at all — previews appear essentially instantly, which is closer to the default behavior than to "off." To reduce previews, you want a high number, not zero. To remove the value entirely and return to default, either set it to 0 or delete it — both land you back at near-instant previews.

Is there a maximum value I can set?

As a 32-bit DWORD, the technical ceiling is far beyond anything useful. In practice, something in the range of an hour (3,600,000 milliseconds) is already long enough that it will essentially never trigger during normal use, so there's little reason to go higher.

Will this setting survive a Windows update?

It's stored under your user account's registry hive, not a system file that updates typically touch, so it should carry through routine updates. A clean reinstall of Windows, rather than an update, would remove it along with the rest of your personalized settings.

Does this affect jump lists too?

No. Jump lists — the menu of recent files and pinned items you get by right-clicking a taskbar icon — are a separate feature and open instantly regardless of this setting.

I don't see an "Advanced" key under Explorer — what do I do?

It should exist on any standard Windows 11 or Windows 10 install, since it's where core taskbar and File Explorer preferences live. If it's genuinely missing, right-click the Explorer key itself, choose New, then Key, and name it Advanced — then create the DWORD value inside it as described above.

Is this safe to do on a work computer?

Yes — it's a per-user Explorer preference, not a system or security setting, so it doesn't affect anything your IT department manages centrally. If your workplace restricts access to Registry Editor itself through policy, that restriction would stop you before this value ever comes into play.

Will this help if I use multiple monitors or multiple taskbars?

Yes. It's a single per-account Explorer setting, so it applies to every taskbar instance across every monitor at once — there's no separate configuration needed per display.

What should I combine this with on a shared or shop PC?

Treat the hover delay as one layer, not the whole answer. Because Alt+Tab and jump lists still reveal open windows and recent files instantly, pair the delay with the basics the privacy section covers: lock the PC when you step away (Win + L), and keep sensitive work in a separate signed-in account rather than relying on any preview setting to hide it.

Revision note. Originally published November 23, 2016. Rewritten August 27, 2026 for Windows 11 and Windows 10. The core fix hasn't changed in a decade — Microsoft still hasn't given this its own Settings toggle on either version — but we corrected a wrong hive name from the original (it should always have been HKEY_CURRENT_USER) and added what the value actually does versus what people assume it does. If a preview popped up somewhere it shouldn't have, we hope this saves you the same awkward moment it saved Jake, next time.