The comma key doesn't work for Limited Expand mode

[Shift] & [Displays] puts the magic sheet in Limited Expand Mode. The magic sheet appears full screen.

[Shift] & [Displays] exits Limited Expand Mode.

The comma key does not work in either case.

I managed to lock myself out of Eos because I had remapped my F9 key. I had to go get another keyboard.

It's also possible for people to use the virtual keyboard to enter limited expand mode.