Currently, the management interface (luci, ssh, etc.) is only available on port 1 and VID 100, so you need to connect your computer to port1 and configure your computer's network card to use (tag all packets with-) VLAN ID 100 (then you can connect to 192.168.1.1).
Certainly not my favourite either, but it works. I'd be very much in favour of changing the defaults as well, but it is a bit more complex to get this 'right', as it's still a switch and not really a router with routing, NAT, and a DHCPd running - somehow I don't think change this in the last minute (for 21.02.0) would be the best idea (personally I'd favour it to be configured for DHCP-client, but then it gets very special, with even more default assumptions that might go wrong…).