How to control submasters on a magic sheet?

I am heading into a new space that is patched 1-to1.  Submasters are set up to control different lighting areas already.

When I have tried to set up a magic sheet in my home theater to control a submaster, it only acts as a bump button instead of fading up/down.

Is there a way to create submasters in a magic sheet that fade up/down?

Still learning magic sheets, so please go easy on me if this is an easy fix.

Thanks in advance!