The Designer option in the Create Object tool is used to add simple geometric shapes to a level, a shape(s) can then be edited using the Designer Tool which is found under the Tools Menu. The following options are available:
To modify an object, click the Edit button under the Designer's Properties panel. For more information, please refer to Designer Tool Tab.
To access the Designer's properties, make sure to select the Designer Entities from the Create Object tab and drop them into the level.