The joint 'boxes' need to be selected and then turned off using AdvanceSteel tools.
Solution: Click on the "Filter Database" button from the main AdvanceSteel toolbar. Then from the flyout to the left, pick "Connection Objects". All joint definition 'boxes' will then be selected. From the main AdvanceSteel toolbar, pick "Presentation objects off". All joint definition 'boxes' will now be hidden.
NOTE:
Remember to press the [Esc] key afterward to make sure they are not still selected. | 
