Reversing Sandbox Decision

I am a new Comodo (4.1.150349.920) user.

I receive an alert for program to run sandboxed. I select “Do not run this application inside the sandbox again”. This then applies for subsequent attempts to run the program - how do I undo this permission??

Many thanks for your help

Defense ±>My Own Safe Files and remove the item(s) you want to run sandboxed again.