Go to My buildings in the left-hand side menu and then click on the three dots of the floor you would like to edit and click on Edit map.
Whether the space is bookable or not can be easily set up in the Map editor by enabling the booking functionality in Step 3 which you select in the bottom menu once in the editor.
Use toggle to activate bookability and confirm by clicking OK.
Save changes by clicking on "Save and close " in the bottom menu.