Automatic screen rotation not available

I have Zorin OS Pro and installed 17.2.
I have installed it on a small device with Touschscreen.
From the iso image it was possible to rotate the screen by turning the device (with the error, that it was shifted by 90° - so landmark was portrait and portrait landmark).
After the installation, the display always stays in same rotation.
I have seen a screen that shows that in the lower right should be a menu wit autorotate - but on my device there is nothing according to rotation. In display settings i can manually rotate the screen.

But how can it be done automatically?