How to diable Wifi on Pi5 via command?

Hi there!
I am an absolute rookie to Umbrel. I´ve successfully managed to get Umbrel installed on my Pi5 NVMe drive (flashed it directly onto the SSD) and that worked fine but only with wired ethernet.
Next I figured out how to enable WiFi and get the device connected to my WiFi. I was able to get that working, but the link quality is not the best and I solely want to go ahead with wired connections. To avoid unnecessary WiFi connections I am searching now for the “opposite” command to disable the WiFi connection.
Anyone who can help?