Zoom breakout rooms

[KKH]

In my recent event with a few hundred participants, many of my participants are not able to find the breakout rooms that they want to join. This is because when many participants have already entered the rooms, their names will appear below each breakout room and it is difficult for the other participants, who have not join any breakout room,  to find the respective breakout room with the 'join' button. How can I hide the participants' names after they have joined breakout rooms? What do I need to do if I just want the names of the breakout rooms to be visible all the time even though many participants have already entered the rooms?