Give this a go. Obviously you need to replace the IP and subnet given with the actual values in use.
Firewall -> Aliases -> IP -> Add
name: “Local Networks”
Description: “Subnets used in local networks”
Type: Network(s)
Network or FQDN: 192.168.10.1/24
Description: vlan 10 for servers and staff
-> Add network
Network or FQDN: 192.168.20.1/24
Description: vlan 20 for Directors
repeat for all subnets
-> Save