NewPowerPoint · Desktop · Mac
PowerPoint: Clear view-only messaging
PowerPoint will display a new "Viewing Only" message bar when users open presentations they lack edit permissions for, clarifying the file status and showing the creator's identity. No admin configuration is required.
Microsoft's description
When you open a presentation you don't have permission to edit, PowerPoint now shows a clear "Viewing Only" message bar. It explains that the file is view-only, shows who created it, and tells you to contact the owner if you need more access.