Waiting room and privacy

[TimCross]

When I set up back to back meetings, the people who are invited to the second meeting wind up coming into the first meeting.  There was some type of new update recently with Zoom that changed a feature I used to manage people joining.  Before the new update, I could go into a feature at the bottom that would allow me to turn on the waiting room so that any new people who tried to join would go to the waiting room.  Then when I was done with my first meeting I could admit the others.  Now, I can't find this feature so when people from the second scheduled meeting in back to back meetings join my meetings a little early, they come into the first meeting.   I like not having to jump off one zoom meeting that I set up, to join another.  I like that they are all in the same digital room, but it only worked if I could turn the waiting room on and off.  Can anyone tell me how to do this in the new updated version of Zoom?