Reduce or expand the space between each of the selected shapes.

PowerPoint add-in PPT Productivity's squeeze and expand features let you quickly contract or expand spacing between selected shapes or objects on your PowerPoint slide (aka Nudging shapes together or further apart). Nudge shapes or objects closer together to make more space on your PowerPoint slide to fit in another shape. Expand the spacing between shapes to balance the empty space on the slide.

The space added or removed on each click is small, so you can incrementally adjust spacing.