Beacons on group rides

I’m new to Zwift and did my first group ride today (BZR coffee ride), which was great, but the leader and sweeper beacons weren’t visible. The leader was giving out lots of guidance, but I had no idea where he/she was. I’m running Zwift on an Android phone - not sure if that makes a difference.

Is there a setting I need to change somewhere so I see these beacons?

Thanks for helping.