You can eject a specific attendee from a meeting if you want to disconnect them without ending the meeting for all other attendees. When you eject a user, they will see a message on their screen that they have been removed from the meeting and will not be able to rejoin it.
To remove a guest from a meeting :
Click on the People icon in the bottom-right corner of the screen to expand the People pane
Click on the ellipses next to the person you wish to eject from the meeting
Choose the Remove from the call option
Click on Remove to confirm you wish to remove the person from the meeting