Zoom "disappears" when moving to breakout rooms

I host meetings with 150+ participants and not all of them are very tech savvy, we'll say. We ask that they have Google Chrome open for another function of our meetings, but it basically just runs in the background all day; it's not something they need readily accessible, just open. 

What I've found is that a lot of times when I open breakout rooms, Zoom becomes the background app and the participants end up looking at their chrome window. Some of them throw an absolute fit because they can't figure out how to get back to the room. Is there a way to stop this from happening, and ensure that zoom will stay as the main window they see when moving to breakouts?