Change Velica from Wireless to Mesh Mode

I recently set up a single Velica in Wireless mode and is working pretty well using Wireguard VPN, and a guest WAN configured to bypass the VPN. I am now thinking of buying a second Velica to use as a mesh but cannot see any option to switch from Wireless to Mesh on the current one without a factory reset and reconfiguration - at least from the GUI. Is this possible? Using the settings in Luci maybe?
Thanks in advance for any help.