I own and manage 2 x55 Deco networks.  One at my house and one at my sister's.

Why is the Deco app merging them? They are completely seperate different SSID, IP subnets and differet physical locations.  The Deco at my sister's is working as router but at my house they are only in AP mode getting the DHCP from my OPNsense router.  Over the weekend my OPNsense router showed up on her network!!  

I am so fed up with the cloud system, I set the network up and some how the network gets changed back.  I have had every kind of problem from the cloud installing deleted devices and changing setting them as main and causing the network to go down.  Rolling back to a previous state that is no longer correct.  To over riding my settings to which node to connect.  For some unknown reason the node wants to connect to the main with only a single bar in wifi stregth.  When the wired outdoor point that has a clear line of sight to other node and has max signal.

Please ditch the cloud app trash and give a back basic web UI control.