The Union command is part of Merge Shapes commands in PowerPoint that lets you unite two or more shapes with each other. The benefit of the Shape Union option is that you can quickly create complex shapes that may not have been easy to accomplish otherwise within PowerPoint. The Union command combines all overlapping and non-overlapping areas of shapes, subtracts nothing, and retains formatting of first selected shape.
Learn how you can unite shapes together in PowerPoint 2016 for Mac.

