How to deactivate touchscreen during phone call

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The problem has been recently discussed here

Proximity sensor goes crazy while calls

Hello to all! I have had an FP4 for just over a month and am very satisfied. Especially the sustainable concept is great. However, I’ve had a problem with the proximity sensor for a few days. First of all, when I use the phone normally (hand-held, not talking on the phone), I don’t have any problems. The problem only occurs when I talk on the phone with the phone to my ear. The problem is that sometimes the screen turns on and the touch function is also activated, even though I hold the phone…