This page should include tips and tricks.
Change language of all text boxes in a presentation in Powerpoint 2010/2013
Thanx to Julia Summer:
- In the left pane, switch tab from "Slides" to "Outline" (using the view menu on top)
- Select all text in outline (Ctrl A)
- Click "Review" tab
- Language > Set Proofing Language
- In the dialogue box, select the language and OK