How to 'forget' wifi connection

Me again,…

How can I ‘forget’ a WiFi connection.
I am hoping that it could be done via UI with a button somewhere.

If I have to edit the /etc/wpa_supplicant/wpa_supplicant.conf, what should be in there? Or can the file be deleted?


Enter a wrong password for this network…

Will that not add additional boot time?
From poweron to actual music output takes about 2 to 3 minutes already…
The whole purpose is to ‘skip’ scanning for wifi that are out of reach and descrease boot time.