Mask or highlight on a Mac document camera feed

Use Mask › Cover Up or Highlight, then Create Mask to hide or emphasize a region while you explain.

Mask hides a region (Cover Up) or emphasizes one (Highlight) on the Present view. It does not arrange several panes — Tiles do that.

Place the mask

Open Present and show the page (Camera, Board, or a tile).
Choose Mask. Select Cover Up or Highlight.
Choose Create Mask, draw the region, and confirm. Move it or delete it when you move on.

Install Vizo from this website.