Hi KellyMJ welcome to the Community.
We have received similar feedback around the chat box feature recently. When using the Pop Out (Flexible layout) only the toolbar remains on top and you need to click the icon to keep a feature open if you are sharing something. A couple of options: If you have a second monitor you can keep the cameras open on the second screen or if you only have one screen you can just share just an application window and resize it so it doesn't fill the whole window.
We see that the need to 'pin on top' various windows and have shared this feedback with the team. We will keep the Community aware of updates to this feature.