My iPhone 11
How to I get to view my pictures horizontally?
iPhone 11, iOS 14
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Open the Photo’s app on your phone, tap on the picture you would like to view and simply rotate your phone on its side.
If your phone has rotation lock enabled you will need to turn it off, this is how to enable and disable that feature: https://support.apple.com/en-gb/HT204547
If you mean you wish to keep your phone vertically and want to rotate the picture then following the tips on this page: https://support.apple.com/en-gb/guide/iphone/iphb08064d57/ios