right click on your wifi icon and select configure network connection then right click the connection you want to delete and click delete. This seems to do the job for me. 
If this doesn’t work why not just create a new SSID (not deleting the old one’s) for your 5GHz network for your machine alone? This way you get to retain the config for your other IoT devices and can use a different SSID for your garuda machine alone not disturbing anything. I apologise if this is not possible I just haven’t done any router configuration before.