Soft Rotaries

Greetings - I have the 4 soft rotaries assigned to my 4 FX returns. Is it possible to assign the button under the soft rotaries to be the FX returns Mute’s?

If it can, I’ll figure it out. If it can’t I’ll quit trying to figure it out.

Learning everyday on this new board - Thanks
Mike F

Is it not already the Mute? That is how it is on mine.

I’ll have to check - but I thought I tried it and it didn’t do anything.