@antibiotic
When you activate a VPN client on a PC, that PC will route all (read on : most !) traffic over the VPN gateway.
This will for sure make a route to you 192.168.1.1 (pfSense) impossible.
But :
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when I entered the LAN IP of pfSense, or the LAN IP of one of my printers with a web interface, or the LAN IP, I could access their (pfSEnse etc) GUI's.