Turn off Preview Pane

Supported on: At least Windows Vista

Registry

HKCU Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

Value name: NoReadingPane

Description

Hides the Preview Pane in File Explorer. If you enable this policy setting, the Preview Pane in File Explorer is hidden and cannot be turned on by the user. If you disable, or do not configure this setting, the Preview Pane is hidden by default and can be displayed by the user.