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Gauss23, thank you for your responses... Looks like I will have to educate myself a little more so I have a better understanding of what I'm dealing here with...

I could run DHCP on the switch, but looks like there is an issue with the one I have available: https://forums.servethehome.com/index.php?threads/brocade-icx-6450-dhcp-problems-with-certain-iot-devices.22725/

I'm confused about few things here...  ;D But most of all I'm confused about what is the difference between Opnsense being my DHCP server and stand alone DHCP server. Opensense itself, doesn't serve IPs, right? It uses dhcpd or dnsmasq. So what is the difference running dnsmasq on Opensense box and standalone box? Why it can't lease IPs to a subnet without interface, another box will be able to?

I'm thinking something like this... https://www.robertparten.com/dnsmasq-dhcp-configuration-for-multiple-subnets/

Gauss23, good questions... I'm not 100% sure... Need to start somewhere, right?
So the picture that I have in my head...
One VLAN will be all CAT6 and 10G fiber devices: 1 file sever and few desktops.
The wireless access point that I'm looking at can do 3 VLANs. I'm thinking to use one for all wireless devices and home assistants, one guest wifi and one for couple untrusty Chinese contraptions that need wifi access.
So it is possible that I will want wired VLAN to be visible to "Home" wifi VLAN, but guest VLAN should have access only to Internet through Opnsense box. So if I setup interVLAn routing it kinda defeats the purpose?

But for DHCP I can setup ip-helper on each VLAN on the switch instead of having interface in each VLAN?

Total noob here... Wiring our house for Cat6 and couple 10G fiber drops... Decided that our current Asus router doesn't cut it anymore...

Here is what I'm trying to do:
ISP Modem --> Protectli box with Opnsense (4 Intel NICs) --> Layer 3 switch with couple VLANs and different subnets. I want Layer 3 switch to do all  routing at line speed for LAN with Opnsense doing firewall duty for the web traffic. I don't want Layer 3 switch to handle DHCP. So one interface on the Opnsense box is WAN, one is LAN to the switch.

Problem: Opnsense can't give out iP leases to the subnets without interface connected to that subnet. That's how I understand this... I don't understand why, that's beyond my skill level at this point.

Solution? Most recommendations online to run a separate DHCP server on another box (Windows, Pi, etc.)
My question is... What is the problem? Is this dhcpd limitation on Opensense? Opensense comes with dnsmasq which has DHCP server and can give out IPs in the configuration described above... Can I just switch to dnsmasq instead of dhcpd and manually configure for my case? Or configure dnsmasq to run on Opnsense box but use one of the free interfaces? For ex, box is 192.168.1.1, can I assign 192.168.1.2 for dnsmasq DHCP server on one of the unused interfaces? Any other options except getting another machine to run DHCP server?