Press CTRL + P to Scribble in a PowerPoint Presentation

This comes in handy when you want to scribble over your presentation to explain something to your audience.

Just press Ctrl + P to change your mouse arrow into a red pen and start writing over your slide.

To erase whatever you scribbled, just press E.

To return back to your mouse arrow, just press Esc.

At the end of your presentation, PowerPoint will ask whether you want to save the ink annotations you made during your presentation. You can either Keep them or Discard.