We know that your gallery cover photos almost always have that "WOW" part of the image you want your viewers to see. No matter what device or screen size they have, you can ensure that they will always be drawn to a certain focal point in the image.
Click on the collection you're working on, and then "Galleries" at the top.
Then click on "Edit". In the settings, click on the "Cover" tab to access your Cover Photo settings.
If you already have a cover photo set, click on "Position Cover". If not, click on "Change Cover Photo" so you can choose your cover photo that best matches your gallery! To change your cover photo, you can drag a photo to upload or browse from your computer.
Don't forget to click on "Save Changes", and then "Publish" or "Update" when you're done!