@Shadius yes I have two orgs, one for work and one for home, hence the drop down. So as you surmised, you will not have a drop down for Org.
As for keeping them separate, there is nothing I can think of that would mean you want to have it this way. I'd simply combine the networks that are on the same physical site as you can always split them out again if you find a good reason to keep them separate, I have done this many times with sites where we have MXs for public access and our own SD-WAN as you cannot have both in the same network, sometimes it works better with one in the combined network, sometimes the other. Never is it best to have neither!
You combine and split networks by going to the all networks view:
If you select a single combined network you can split it out to the separate parts.
If my answer solves your problem please click Accept as Solution so others can benefit from it.