I want to setup Deco M4 as router directly connected to unifi modem, but the TM unifi VLAN profile also sets up the IPTV and it says that the other LAN port can only be used for IPTV. I don’t use the IPTV (although my home unifi package includes HyppTV). Instead, I need to use the other LAN port to connect to a network switch because I have a couple of devices that need to connect to the internet using LAN cable (those devices can’t have WiFi). This needs to be at the main M4 unit b'cos those devices are located near the unifi modem. How to configure M4 without the IPTV? If I don't enable the VLAN, then M4 won't connect to the unifi.

It works now; didn't know that have to scroll all the way down to find the Custom option. Thanks for your tip!