I don't see mount module documentation with the Ekos doc at docs.kde.org. In particular:
On INDI Control Panel for Celestron AUX mount
1. What does "On Set": Track, Slew, or Sync mean?
2. What does "Home": AZ/RA, AL?DE, All do?
3 On Motion Control Tab What are the effects of Motion N/S, Motion E/W and Reverse.

On Mount Control, for GEM mount, I presume up/down arrows are for DE and left/right for RA. That seems to be the case for my Celestron CGX mount, However when I slew with one axis, I see both RA and DE values changing.