@terziyski Thanks for the replay. But as I understand, you said that AP Isolation can isolate WIFI bands from each other. And from the router help panel, Interface Grouping can isolate the group as one unit (no communication between groups, but clients of the same group can communicate with each other).

I want even stronger isolation - isolate clients from all home network​​​​​​.

Currently, most of my important things are connected via LAN, and all my WIFI clients, just need internet access without home network features/communications. So, in order to add an additional security layer, I want to disallow WIFI clients to be able to access other things on my local networks. I'm not sure that AP Isolation and Interface Grouping can achieve that...