Hi Msalta,
Thank you for posting your query on Microsoft Community.
- Are you referring to icons in the taskbar?
- Which version of Windows is installed on your computer? Because in some version Group policy in not available.
If the taskbar thumbnail previews of multiple windows/tabs opened for an icon go past your screen's edge, then they will automatically be displayed in list mode instead of thumbnail preview mode.
For example, if your screen resolution is 1200x800, and say you have more than 15 tabs open in IE, then it will display in list mode when you hover over IE's icon on the taskbar.
You may try the following steps to disable the Taskbar thumbnail preview in Windows 7.
Step 1
- Open Run windows by pressing Windows Key +R and type gpedit.msc and hit Enter.
- Go to User Configuration, Administrative Templates, then Start Menu and Taskbar in left pan of Group Policy Editor.
- Locate “Turn off Taskbar Thumbnails” in right pan of Group policy editor and double click.
- Select “Enabled” and click “Apply” and “Ok”.
Step 2
If it doesn’t work please follow the second step which is given below.
You can disable the taskbar thumbnail feature (sort of) in Windows 7 using a registry edit. This can be done by setting the taskbar thumbnail preview hover delay to a large value (say 10000 milliseconds or more), so that the preview is not immediately generated when you hover over a taskbar icon.
- Open Run windows by pressing Windows Key +R, type regedit.exeand press ENTER
- Navigate to the following location:
HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced
- Create a new DWORD (32-bit) value named ExtendedUIHoverTime
- Double-click ExtendedUIHoverTime and click Decimal
- To increase the hover delay to 5 seconds, type 5000. Type 10000 for 10 seconds and so forth…
- Exit the Registry Editor.
- Restart your computer.
Important:To do so: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 (http://support.microsoft.com/kb/322756/ )
Hope this work, if not please get back to us with the results. We will be happy to assist you.