Deleting Barriers
To delete a barrier, right-click on the barrier and select Edit > Delete Barrier 
from the popup menu.
You can also:
- Select Delete Barrier from the Barrier menu.
- Select the barrier(s) you want to delete, then press Enter.
- The selected barrier(s) will be deleted.
If there is only one barrier in the model, that barrier will be automatically deleted when you select Delete Barrier from the Barrier menu. You do not need to select the barrier.