How to Draw Lines and Basic Shapes on Your PowerPoint 2016 ...
Fixing a mistake: If you make a mistake while drawing a shape, the Undo command on the Quick Access Toolbar can usually correct the mistake for you. Holding down the Shift key: If you hold down the Shift key while drawing a shape, PowerPoint forces the shape to be "regular." That is, rectangles are squares, ellipses are circles, and lines are constrained to horizontal or vertical, or 45 ...