Google Drive Presentations provide settings to adjust the page size of the presentation. Today many screens to display or project are designed as WIDE screen and adjust a standard size presentation accordingly.
Adjusting Page size can be found when editing a presentation from the top MENU
Best Practices for Presentation Size Settings
Presentations made for projecting: WIDESCREEN 16:9
Presentations for embedding on websites: STANDARD 4:3
Presentations used for flash-like animated slideshows embedded to website: CUSTOM SIZE 16 X 12 inches
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