How To Share Google Slides
In Presentation Mode
Open your Google Slides presentation.
Click on "File" in the top menu.
Select "Share" and adjust the permissions (Viewer, Commenter, or Editor).
Copy the sharing link.
Replace "/edit" at the end of the URL with "/preview" to force presentation mode.
Share the modified link with others.
When they open the link, the presentation will start in full-screen mode.