Hello @John1013,
You can go to your listings and click on the "Manage listing" button. Then scroll to the "Rooms and guess" section and click on its "Edit" button. You can then select "Private room" by clicking in the "What will guests have?" box. Then save the change.
I'm not sure if you have any future confirmed reservations. If you do then those guests have to be given the space as it was when they booked it i.e. the entire place with no one there but themselves.
Steve.