If you have created an opening in a ceiling, you can resize or reshape the opening by clicking and dragging its edges or corners.
To resize or reshape a ceiling opening:
In 2D plan view, click on the opening edge you want to move.
To resize the opening, hover your pointer over the center of the currently selected opening edge, then click and drag the edge to adjust the opening size.
To reshape the opening, click and drag a corner grab handle.