Method 1: Enable or Disable Thumbnail Previews using System Performance Settings. Enable or Disable Thumbnail Previews in Windows 10. It works in Windows 10, Windows 8 and Windows 7 without issues. To run it in Windows 10, download Winaero Tweaker from here. Adjust vertical spacing between the thumbnails. Adjust horizontal spacing between the thumbnails. Adjust number of grouped application thumbnail windows. It can control all mentioned parameters in the article and many more. It can tweak and change many hidden secret taskbar thumbnail parameters which cannot be changed via the Windows 10 GUI. In the past, I created a freeware tool called Winaero Tweaker, One of its options is "Taskbar Thumbnails". If you would like to avoid Registry editing, here is good news for you. Don't forget to restart the Explorer shell. 
You are done! To restore the defaults, just delete the above mentioned NumThumbnails and ExtendedUIHoverTime values. Note: If you are running 64-bit Windows 10, you still need to create a 32-bit DWORD value.
Create a new 32-bit DWORD value named NumThumbnails. Go to the following Registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Taskband. The list makes it easier to identify them from a group instead of mostly similar looking thumbnails. Once this is done, Windows 10 will show a list of windows instead of thumbnails. It is possible to disable taskbar thumbnails only for a group of opened windows i.e.multiple instances of the app. This will disable taskbar thumbnail previews in Windows 10. Restart the Explorer shell or sign out and sign in back to Windows 10. So, with such a high timeout value, you will never see taskbar thumbnail previews. This means it will show the thumbnail after 9000 milliseconds (or 9 seconds) of hovering over any taskbar button. Note: If you are running 64-bit Windows 10, you still need to create a 32-bit DWORD. Here, create a new 32-bit DWORD value named ExtendedUIHoverTime. Tip: You can access any desired Registry key with one click. Go to the following Registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced. 
To disable taskbar preview thumbnails in Windows 10, do the following:
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