1
Click File
Open the File menu.
How to change the size of a Google Slide
Change the slide size - standard 4:3, widescreen, or a custom size - in Page setup.
Operations
2
Click Page setup
Choose Page setup.
3
Open the size list
Click the page size drop-down.
4
Choose a size
Pick Standard 4:3, Widescreen 16:9, Widescreen 16:10 or Custom (type your own width and height).
5
Click Apply
Click Apply.
6
Slide size changed
All slides use the new size. The size applies to the whole presentation.
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