Instagram is a great way to share photos with friends and family, but sometimes you want to post photos in a different orientation. Here’s how to do it! To post a horizontal photo on Instagram, first open the photo in the app and tap the “Layout” button at the bottom. From here, you can choose between “Horizontal” or “Vertical.” To post a vertical photo on Instagram, first open the photo in the app and tap the “Layout” button at the bottom. From here, you can choose between “Vertical” or “Horizontal.” ..