Is there any way to deny a device using the Surfboard Cental App?

I have an odd cell phone and printer from one of my neighbors showing in the Surfboard Central app after running a scan. I would like to deny this IP or Mac device but I find no option to do so using the SB Central app. I could do this if I log directly into my G-36 modem using the web interface but right now I have Wifi OFF so that the W30’s on my mesh setup handle the devices in my home. Does anyone have instructions on how to knock unwanted devices off your channels?