How to run an installed application as an admin?
On macOS the Finder hands off application starts to an admin cleared process named launchd. You don’t really have to do anything to run as admin since all apps run as admin when programmed to do so. What macOS does differently than windows is sandbox details and some files being immutable / read only / protected.
The closest analogous item might be adding the disk drill app to Full Disk Access, but I would check with the vendor and release notes before adding it unless you are sure it’s working correctly or have a backup.
This message isn’t really correct on macOS and wasn’t on OS X before either.