About right-to-left presentations
The feature or some of the options described in this Help topic are only available if support for right-to-left languages is enabled through Microsoft Office Language Settings.
Microsoft PowerPoint allows you to enter, change, and display right-to-left text in both right-to-left and combined right-to-left/left-to-right environments. If you are using the Arabic or Hebrew version of PowerPoint, then PowerPoint automatically opens new presentations with right-to-left paragraph alignment and text direction, and the screen will have a right-to-left appearance.
If you are not using the Arabic or Hebrew version of PowerPoint, you can still change paragraph alignment and text direction, and enter, change, and display right-to-left text by enabling Arabic or Hebrew through Microsoft Office Language Settings.