I can't see the second participant

Good morning, I am new to this, I installed jitsi and jibri on my own server, but when watching the videos, the other person cannot be seen, only I appear in the video. I select the box “everyone follows me” and then I put the mode “mosaic”. What is this about?

This is a bug, which is already fixed in the latest versions in unstable, you can update to those and fix this.