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Once the third screen is connected to your laptop, you should arrange the displays in the Mac OS so they match the physical setup in the room. This makes it much easier to use especially when in a meeting where you want to be able to focus on the attendees and what you are presenting. In the System Preferences Displays Arrangement section turn off the Mirror Displays setting so that you can extend the displays. You can drag the displays to arrange them to match how they are in the room. Then when you move your cursor from one display to the other it will work as expected. To determine which display is which, click on a display in the dialog box. That screen will show a red box around the outside edge of the screen so you know which one you are moving.

Click on the Slide Show tab and click on Presenter View and then resize the colored rectangle to display the slide portion of the presentation. This will only display the slides. (For those with Dual Monitors, there is also an option to Swap Displays if needed.)

Open PowerPoint and initiate presenter mode. The secondary monitor will show the PowerPoint slides, while the primary screen displays the Presenter view.