Clean one room

How can I program my L40 Ultra AE to clean a single room or just a couple of them at a time.  The auto map function mapped my house and identified individual rooms (including some that don’t exist).  I would like to manually control the unit so it cleans only certain rooms at a time.   The only option I see is to clean all rooms.  

Following, as I would like to know how to do this.

On the robot's home page, the one with the map, you should see three options: Room, All, and Zone. Clicking Room will select the rooms to be cleaned.

I have a dreame L40 ultra and I can't the mop pads to register. It keeps saying attach mop pads and they are. I cleaned the magnet How do I fix thus?