Requirement: Open PowerPoint files in slideshow mode in SharePoint Online.
How to Open PowerPoint in Presentation mode from SharePoint Online?
Any link to PowerPoint presentations (PPT, PPTX, or PPSX files) takes users to the Edit mode of the file. Even if the users don’t have permission to edit, SharePoint opens it in edit mode with a banner saying you can’t edit the file. So, How to force slide show mode for PPT’s?
Well, here is the trick to open PowerPoint files in presentation mode: use the below URL format to have PowerPoint open in presentation mode:
This link directly launches the PowerPoint presentation in the slideshow mode in full browser screen!
How about SharePoint On-Premises?
Similarly, in SharePoint On-premises, use the below format to open PowerPoint in presentation mode: