The Opening Header is the dotted line that is drawn over every door, window and opening.
The Opening Header can be switched on and off by the tick box at the top of the screen.
When off, the dotted line will be removed.
When switched off, Openings cannot be edited, moved or deleted.
Doors and windows can be still be removed.
When switched on, Openings can now be edited, moved and deleted.
Click on the dotted line to reveal the handles (or grips) allowing the opening to be deleted or the size edited.
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