This is from the Rev A Sport EX Pilots Guide, July, 2019, which can be downloaded from the GRT site.
7.12 GPS Course Deviation Indicator (CDI)
The GPS CDI (Course Deviation Indicator) is located at the bottom center of the screen whenever a waypoint is active in the GPS flight plan...
Other info here, but I think it’s the gps version you’re asking about.
7.14.3 VOR/LOC CDI Display Options on the PFD
Hopefully that’s useful. If you’re already aware of that info I can’t help you.
-jim