Dawn band-steering - excluding SSID?

I'm trying to work out Dawn's behavior and I'm not sure if this is something I need to worry about or not but...

I have several SSIDs in the house, with two APs. The LAN ssid is provided by two APs, but the IOT devices don't move and have only one AP to support them.

When I look in the Luci app, I see the IOT ssid listed. I don't want/need Dawn to be steering those devices. Actually they should only know the password to one WiFi anyway. If this is the case, is Dawn essentially idle for those clients? Do I need to exclude the IOT ssid from Dawn somehow to avoid confusion?