Here are three easy ways you can use to rotate an image in Lightroom. These also work with multiple images to save time.
Lightroom Classic CC Tutorial Rotating and Flipping Photos Adobe
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How to Rotate an Image in Lightroom
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How to Rotate an Image in Lightroom
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Three Easy Ways to Rotate an Image in Lightroom - Lenscraft
Lightroom Classic CC Tutorial Rotating and Flipping Photos Adobe