I use the thinkrider app all the time, and re calibrate before each ride. It is called thinkrider tools, I click on raceration calibration > selection device and once I click on my device I go back and click again on raceration calibration. (no device can be connected to your trainer tho, otherwise it won't detect your trainer)
However, I would stay away from XXprO because appareantly it slips or there was a russian video about it so I just bought thinkrider x2 max which was $230, but Cycplus r200 looks way better tho, so you should go with that.
Aah that makes sense, I was wondering what the hell that option did. "Raceration" didn't give much clarity

The app is still a bit mysterious, when I downloaded it from google play store, it was all translated to spanish, and couldn't switch?
Then downloading the apk from their web-site gave me an english version, but with 3 extra chinese options, which I have no idea what they do.
I haven't noticed any slipping, only some odd sensation when climbs are over 19% and I'm in low gear, but that seems common with motor driven trainers.
It does smell a bit burned after you do a hard sprint on it though, that may be the motor brakes?