hardware – How do I create a "System" screenshot with ButtonMapper?

Since a recent update by ButtonMapper, the ability to create a "system screenshot" (if you have root) has apparently been replaced by an "app screenshot" that is restricted in some Snapchat apps to Instagram and also creates a very annoying click sound , I understand that non-rooted users prefer this to nothing. But I want to have my "system screenshot" again if I press the "volume down" button for a long time.

I bought the Pro version of ButtonMapper and have root access. Can someone please tell me how I can reset my "System Screenshot" functionality to reduce the volume in Button Mapper for a long time? I miss it so much.