Win10: How do I turn my collages from landscape to portrait?

To create a portrait collage, if you have a tablet-like laptop and rotate your device to portrait mode and then start a new collage.  If you do not have a tablet-like computer, when you start a new collage, tap the bottom-left icon that allows you to choose the size of your collage. Scroll to the right of the bottom bar to choose a portrait-sized collage.

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