Changing break out rooms once open

Hello

Is there a way to access and amend the options for break-out rooms once you have opened them?  For example, I allocated these this morning and sent everyone off, then realised a setting from the day before had been applied to "automatically close" within 20 mins.  I couldn't see a way to override this so simply had to wait for them to shut and then reallocate and remove this option.

Also it would be good to be able to apply some settings to some rooms but not to all, perhaps that is a separate question...  

Thanks

Sue