Automatic assignment in breakout rooms

Hi,

Could someone kindly help me. I plan to create 2 breakout rooms with automatic assignment of participants, then bring everyone back to main room for a chat and again move them to new set of breakout rooms. I just need to ensure that each time there are different people in the rooms. I wanted to ask if when creating the breakout room second time, I just click on 'recreate' button and the system will create a new mix of people, or clicking recreate will create the rooms with the same people like the first time. 

Thank you.