To manage thumbnail previews through File Explorer on Windows 11, use these steps:

1. Open File Explorer.

2. Click the "See more" menu and choose Options

3. Click the View tab.

Option 1: 

Check the "Always show icons, never thumbnails" option to turn off the feature.

Option 2: 

Clear the "Always show icons, never thumbnails" option to turn on the feature.

4. Click the Apply button.

5. Click the OK button.