Select Next/Previous player grayed out

In the Chord Pads settings under the Players tab one can have multiple players set up and under the Remote Control>>Player Control tab one should be able to set up RC keys to choose next/previous/mute player, as far as I get.
My problem is that this whole Select/Mute Player section is almost always grayed out and doesn’t function. I rarely see this working and can’t figure out the conditions for it to work properly.
IDK is it the function going wrong or am I missing something in the way it works, but any help appreciated,

Same problem seems like no one else is using this feature?