First, identify your Built-in Adapter Name

ifconfig | grep wl

You shall get something similar like this:

Now to find out the Wireless Kernel Module in use with this command

readlink /sys/class/net/wlo1/device/driver

wlo1 is the name of the card I want to disable,

The output is something like this:

rt2800pci is the name of the driver

Turn Off Wireless Interface with the:

sudo modprobe -r rt2800pci

Finally, to make the change permanent then Blacklist it by editing:

sudo nano /etc/modprobe.d/blacklist.conf

And appending the blacklisted Network Interface Module like:

blacklist rt2800pci

Taken from here