The scroll bar of my breakout room window disappears during set up of breakout groups.

Hello,

I join my company's zoom meeting and become the host.  I am responsible for creating breakout rooms.  Lately the scroll bar of my breakout room window disappears which makes it hard to set up a larger number of rooms.  It happens sporatically it seems.  The account used for the meeting is not mine.  It is my bosses' and no one else has this trouble.  Any help would be appreciated. We are using zoom workspaces and would have the latest updates installed. Thank you