Youtube stream with multiple users

Hi, recently we cannot figure it out how to change settings the way they were before when screen was changing of whoever was speaking, but now there is grey background on youtube and shows all the cameras of participants at the same time, we cannot find how to change it back the way it was

For squares bottom right. Or if you want that on the recording/stream first enable everyone follows me from the web browser, you can find it in settings then switch off the grid view from the four squares.

I tried this, no grey background but its not switching automatically on whoever is talking

This means you had pinned someone, look for blue order around the thumbnail. The one that stays there, you need to unpin it by clicking second time.