Learn how to show or hide file icon overlay on thumbnails in Windows 11/10 using File Explorer Options and Registry Editor.

Learn how to enable and disable thumbnail previews and display Thumbnail Previews on Network folders in File Explorer of Windows 11/10.

But in my tests, setting Adobe Reader as the default program robbed PDF Preview of the ability to show thumbnails, although it could still use Windows Explorer’s preview pane.

On Windows 11, you can clear the thumbnail database cache to resolve problems showing previews on File Explorer, and in this guide, I'll show you how.