Update. Been using Zorin 18 Core Beta as a VM in virt-manager on PCLOS Debian KDE and to remove via the terminal:
sudo apt-get purge brave-browser
you will be asked for your login password and after you hit the enter button you will be prompted if you want to continue, [y/n].
If you continue with 'y', you will be advised to remove Brave Keyring with:
sudo apt autoremove
this will then remove the Brave Keyring and nothing else.
Next you will want to remove the repository entry for Brave Browser - the best tool for this is to use Stacer. To play safe, first switch it to off (you will be asked for your user password), then select the repository and click on delete at the bottom of the window, again you will need to enter your user password.