1. Go to your PowerPoint and put your Presentation in Slideshow Mode or press F5

2. Press alt+tab and select the Remo Event

3. On the Remo Event, press the Present button at the bottom menu toolbar to start Presentation Mode

4. The Event Host or Speaker in Presentation Mode must select Share Screen from your bottom menu toolbar

5. Select the tab labeled Application Window, and a list of windows that are currently open will appear. Select the Powerpoint presentation and click the Share button at the bottom right of the window

Note that the presentation must be open. If it is minimized, it will not appear on the list. 

6. Guests will now be able to see the PowerPoint presentation in full screen