Disable_Pi_4_Wireless_through_firmware:
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You may want to fully disable wifi & bluetooth on the Pi4 at a hardware level.
Since you may not be using it (Like through my web server and nas is wired for exsample).
This can save large amounts of power and cpu resources, and less wireless interfernce wasted.

You can disable wireless through the config.txt file by:

1.
sudo nano /boot/firm*/config.txt

2.
add these lines to [all] on config.txt:
dtoverlay=disable-wifi
dtoverlay=disable-bt

press CTRL+X to save and exit.

3. Just reboot and wireless should be fully disabled on Pi 4 at firmware level.

Source: https://raspberrytips.com/disable-wifi-raspberry-pi/
Date: February 22nd 2022