What does the "Scan only applications" option do and should I have it on?

Basically title, new to bitdefender and I have internet security. I came across this option and was confused as I did not know whether this meant that it did not scan other applications! I do not want that! However the description makes it sound like that it scans the apps in the memory, which is great and i want to do that. Do I turn it on or off? I want the maximum security that is possible to have.

Can someone explain this option and consult as to what I should do here?

Additionally anyone have recommender bitdefender settings that I should follow?

Thanks, Much appreciated!