How to disable the "exit the breakout" floating dialogue?

[KevinCobalt]

When the countdown timer starts running at the end of a breakout the participants will see a dialogue box telling them something along the lines of "Click OK to return to the main room now".  This causes problems as some people instinctively click "OK" returning them to the main room early; despite actually needing to use the remaining countdown time to wrap up their breakout.

I've noticed this only occurs when some people are zoom host and not others. Please can you tell what setting controls this behaviour?

Thanks 

Kevin