Dual R3 motor calibration

I have installed a Dual R3 to drive my 1/3 HP garage door motor. It works fine using the app to open and close with a 300W load limit to stop it at either fully opened or closed.
The app reminds me each time I open it to calibrate the motor. As the motor has no limit switch installed, when I first tried to use the calibrate feature it ran in one direction and stopped with the motor still trying to run for a few seconds before I chickened out and manually stopped it.
I would like to understand how the calibration works and if it does require limit stops on the motor? Also how can I prevent the warning to calibrate the motor each time I open the app?

We will add the manual calibration feature in the next OTA, please wait for the update.