As the Host, you can enter and leave Breakout rooms at will.
1. Once your Zoom meeting has started, click Breakout Rooms.
If you don't see the Breakout Rooms on your menu bar, you'll need to turn on that feature in your Zoom settings.
2. Select a room to join and click Join. Then click Yes to confirm you want to join the room.
3. To leave the Breakout room, click Leave room. Then click, Leave Breakout Room.
You can tell which breakout room you are in by looking at the top of the Zoom window.