How to use the filter
Click on the Filters icon first.
There, pay attention to the third section, which is "Schedule".
When you need to see in the drawing the elements used in the chosen report, tick the option "Scheduled".
When you need to filter the drawing to the elements NOT used in the chosen report, tick the option "Unscheduled".
📝 Note!
The filter's results are based on the currently active sheet of the report.