At some point, I will add a few details about the ARC Pro analogue mode here: https://slotracer.online/community/showthread.php?tid=181
In the meantime, the important thing to remember is that when you flick the switch to change mode, the app changes from the ARC Pro version to the ARC Air one. I have found that if you switch while the app is open, it can cause all sorts of confusion (for the app and for the user). Before switching I recommend closing the app, then dismissing / hard-stopping the app and then launching the app afresh.
You could go even further and - if you have a spare device - use one device for ARC Pro digital running and the other for analogue mode (ARC Air) running. That way, you have everything set up as you need it as soon as the app is open. I use ARC Air for public events - it's quicker for complete newbies to get the hang of - and I use my Fire 7 tablet exclusively for analogue running. At home, I really only use the app for digital racing with the app on my iPhone or iPad.