The second method takes a bit more setting up, but is much more useful. The downside of this method is that the cursor has to be moved onto the second screen so if you are using a projector, everyone in the audience will see the mouse cursor on the screen which can be distracting. Be careful not to click twice as a click also advances the slides once the slideshow has the focus again. This will change the focus back to the running slideshow and let you control it again. You have to move the cursor over onto the monitor showing the fullscreen slideshow and click once. Through trial and error I have discovered two ways to recover from this - one easy but ugly, and the other much more useful. The View Slideshow menu item does nothing, as does the slideshow icon at the bottom of the document. It lets you pick which screen to show the fullscreen presentation on, but if you move the cursor back onto the screen showing the PowerPoint app itself and do anything useful there (click a window, resize a view, scroll down, etc.), there is no obvious way of getting back to controlling the presentation that is displaying fullscreen on the other monitor.

As anyone who has tried it will know, the implementation of dual monitor support in Microsoft Powerpoint v X for Mac is really really useless.

Change title in powerpoint for mac