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There is an aspect of the Lightroom crop tool that is not as intuitive as it could be (based on how often the question gets asked), and that is how to change the orientation of the crop rectangle.
Let's say you have a photo with a landscape orientation, but you want to create a portrait orientation crop within it. Here's what you need to do:
Since the aspect ratio is locked in, as soon as you decrease the length of the long side to the point that it is no longer the longest side the orientation has to switch to maintain the aspect ratio. Once the orientation has changed you can re-position the photo for best composition. Believe me it is easier to do than explain! Give it a try.