Change device_class in GUI

Hi,
I have a problem to set a binary_sensor to device_class “none” via GUI (see screenshot). I can select a lot of typs inside the “show as” dropdown but not “none”. And when I delete device_class with the “x”, it is set to “none” but I can not save it. So this is maybe a bug.

But this brings me to the next:
I also wanted to change the device_class for a sensor, but the sensor GUI doesn’t allow to select the device_class. It would be very nice to add this feature.