Open File Explorer
Click Quick access
Under Recent files, right-click a file and select Remove from Quick access
To clear all recent files, open File Explorer
Click the View tab
Click Options
In the General tab, under Privacy, click Clear
Uncheck Show recently used files in Quick access if you want to stop showing them
Click Apply
Click OK
Open Settings
Go to Personalization
Click Start
Turn off Show recently opened items in Jump Lists on Start or the taskbar and in File Explorer if needed