Use full screen size (including notch) for MacBook Air M2 with sidecar

[kolorfilm]

I tried to use the MacBook Air M2 together with my MacMini M4 Pro + Dell 3223Q Display. The Dell is the main display.

When I enable sidecar it enables a Picture in Picture mode (I guess?) It doesn't use the full screen size of the Air (black border on bottom and top of the screen). Is it possible to somehow use the full screen size?

This are my current settings:

[waydabber]

Hmm. Are you sure you are using Sidecar? Isn't it Airplay? Sidecar is for iPads. Maybe I misunderstand the issue.

[kolorfilm]

Ah sorry yes you are right it is Airplay.

The screen of the MacBook Air has black borders on the top and bottom of the screen itself with the resolutions.