To clear run history in Windows 10, follow these simple steps.
Click Windows Key+r to open Run
Click the drop-down arrow to check your run history
Run regedit to open the registry editor.
You will need to click Yes in User Access Control (UAC) to confirm
Click on RunMRU
to see the contents listed in the right pane
Right click and highlight all content except (default). Do not delete Default.
Confirm Yes for the Confirm Value Delete
Press Windows Key+r to open Run – click down arrow to confirm your run history has been deleted