Yes, I have been talking about Network -> VLAN -> LAN.
Ignore what I have said about the physical interface since it is relevant to newer FW in this case.
If you have configured everything as in the configuration example, you should be able to receive an IP address based on which VLAN id you are using. For example, if you have 2 VLANs (VLAN 11, 192.168.11.1 and VLAN 22, 192.168.22.1) and configure your PC to use VLAN id 11, your PC will receive IP address from the 192.168.11.0/24 network and will be able to communicate on that VLAN. Similarly, if you change the VLAN id to 22 on the PC, your PC will receive an IP address from the 192.168.22.0/24 network.
Could you please verify that it works this way?
(To set VLAN id on Windows10, Run the Device Manager -> click on Network adapters and go to properties of your network adapter -> Advanced tab -> Property: VLAN ID - Value: your VLAN ID)
Also, it is better if you create a separate LAN interface if you want to use VLAN 11. The default LAN should have ID '0'.
Could you please attach a troubleshoot file as well? It can be found in System -> Administration -> Troubleshoot. A topology with IP addresses would be great as well.