Screen does not rotate back (Button Missing)

I use kurvigen on a Android Tablet (DMD 865). All buttons, for example for comfirmation are very small and hard to hit.
Anyway, my main problem is. I loaded a tour and unluckily I pressed the “screen rotate” button. Now this Button disappeared and I’m Not able to rotate the screen back to the original Mode. Interestingly, this wrong tilted screen only affects the navigation mode.

Please Help
Andy

I assume that this happened while your DMD tablet was mounted on the bike.
This button appears only when the app thinks that the tablet was rotated. This may occur when you lean in curves or when the bike is on the side stand. The button will reapear when the app detects that your tablet is in the other orientation (your bike straightened).