nm-connection-editor not showing the full list of networks

I’m running ubuntu 18.04 with a custom i3 desktop that launches nm-connection-editor when an icon on my bar is clicked. What’s annoying me is that nm-connection-editor doesn’t appear to be showing me the full list of wireless connections available, only the ones that I’ve already connected to in the past. Is there a way to get this thing to display the full list of networks, and if not, is there a GUI program that can be launched from the command line that can do this?