You can change the room of a period in the timetable: Click on the <Allocate/Delete this room> button or right-click into the timetable and select the menu item of the same name.
Swapping a room
If occupied rooms are also displayed in the room allocation dialogue, they can be used depending on the choice of option (room clash, room swap etc.).
By activating the option 'Allocate additional room' you can add another room.