To screen share in "present" (Powerpoint) or "play" (Keynote) mode, you need to screen share your entire desktop.
Note: "Present" mode won't work if you only screen share your application window! It will work if you share your entire desktop.
How to screen share your entire desktop
- The first time you screen share, you'll be asked to install the Pluot Chrome extension. It takes a couple seconds. (You only have to install this once.)
- Click "Screen Share" in your menu.
- A window pops up, where you choose what to screen share.
- Click "Entire Desktop."
You now are sharing your entire desktop and can start your presentation.