In the Floors module, selecting the floorplan option will grant you access to the corresponding floor platee for each floor:
You can also update the floor plan here:
Selecting draw floorplan option will enable you to draw the polygon for the corresponding unit in the floor plan:

Utilize + and - buttons to zoom in and out, and always remember to save your path after drawing.

Clicking on the delete button will remove the entire floor along with its units.