Apple once again shows courage to change, the new iOS14 shows incoming calls only as a small banner, so you can stay in the open application, but for all those who use their phone to the predominantly most important part for telephone accessibility, the new update on the iPhone can become a problem. It is easy to miss a call.

It's nice that the "fruit merchant" from the USA gives us a choice here:

Search for Phone in Settings and change "Incoming Calls" to full screen and you will see incoming calls in your entirety again.