what I did up to now is to focus manually or with auto focus on a star, which works fine!
But which settings to focus on a great object like M31 galaxy?
Sub frame or full frame?
Focus the center of the galaxy or the stars at the edge of the galaxy?
The focuser module starts by moving in/out and if it does it too much and creates the donut, it gets lost. I've tried pretty small step values, which makes me think I need to try even smaller steps. Tonight I'll try 5 or something tiny. (assuming clear skies)
I can't offer screenshots at this time, but you will find among the check boxes in the focus module one called full frame. Then there are two fields to enter % of inner and outer fields to exclude. They are used to avoid confusion in the center and stars with aberration in the corners.