Update:
Still not sure why it shows up as hidden. It still shows up normally on my computer (Win), tablet (android), and phone (android). I did check with another travel router I have (HooToo TripMate Nano). Interestingly, the wifi also does not show up on it for possible bridge/repeater connection on the TripMate Nano.
I tried you suggestion, but I don’t think I know enough to do it. I already had a single saved station that I knew worked. It is a WPA2 secured wifi with the SSID broadcast. I wanted to keep that one as I will use it again later. I therefore set up a temporary wifi to connect to and set as another repeater. I used the repeater GUI to create the connection. Unfortunately, when I went in to LuCI, I couldn’t edit the saved connection. In LuCI, there is a interface called (WWAN) that seems to be where the repeater connection is made. It seemed to be named and setup as the first saved connection that I wanted to keep. I couldn’t find anything that matched the second saved connection that I wanted to use to edit. Can you explain how I can edit the settings from the second saved connection in LuCI? (or how to just set it up in LuCI?) Is there any normal way to set up a repeater/bridge with a hidden network?