Show connected devices by network (main, guest)
You cannot determine devices are on your guest network without clicking into device details.
To do this, eero could provide 2 headers in device listing. Currently on your network becomes "Currently on your (main network name) network" and add another header titled "Currently on your (guest network name) network", then list devices under each header by network
This would also work later if you decided to implement multiple network names, because you could just add a header for each network.