Set the heating correctly

I found the error, the controller was deactivated in the service menu, I have now activated it and now I can adjust the end and starting points of the heating curve, the end point was set to 90 degrees and the starting point to 20 degrees, no wonder the heating was always running at maximum flow temperature, anyone got an idea how high the end point should be approximately for underfloor heating?

that depends on the house but set it to 45 for now then you can slowly go down over the next few weeks...

In plain English, it means if I set the endpoint to 45, the flow temperature at -10 degrees is 45 degrees, right?

yes and also at -20

I guess with an outside temperature of 5 degrees, 28 degrees flow temperature should be enough since I already reached 22.6 degrees with 30, and this is also the "coldest" room in the house

the question now is night setback yes or no?