In Windows 10 and 11, you can enable it by opening File Explorer, clicking the View menu, and selecting Preview pane. Once enabled, you can click a file to see its contents displayed in the pane.

If File Explorer keeps restarting on your Windows 11/10 PC, modify the BannerStore registry key, disable suspicious shell extensions, run antivirus, etc.

Stop File Explorer From Displaying Frequently Used Folders Toggle Navigate, Preview, and Details Pane On or Off Open Files and Folders With a Single Click Select Items Using Checkboxes in File ...