Fritzbox Tools - Set Fallback Mode (mobile connection, mobile as fallback, mobile disabled )

Good morning everyone :smiling_face:

I have a Fritzbox and use a connected LTE stick as a fallback solution when the internet via cable (once again) fails. However, since cable has often been overloaded or completely failed in the evening lately, I would like to be able to manually switch between LTE and cable. I have already installed Fritzbox Tools and successfully integrated the box - however, I don’t see any way to make the desired setting. It would be great if you could help me.

This is what the page in the Fritzbox looks like:

Greetings
MrM