Turn your mouse into a laser pointer
https://support.office.com/en-ie/article/turn-your-mouse-into-a-laser-pointer-77367b36-d25b-4ed2-8c87-358bc216a1e0
Using your mouse as a laser pointer for better PowerPoint presentations
Use a simple keyboard shortcut (Ctrl+P) to turn your mouse into a laser pointer during your PowerPoint presentations. You can also use the Presenter Mode commands. This feature has been part of PowerPoint for years, but was recently integrated for touch-screen devices. If you hold your finger or stylus down on the device, the red button fake laser pointer will appear.