How to get 3 photos on a gallery

I have created a gallery on the screen which has several photos within it. When opening the website only 2 images can be seen, as shown in the first image below. However, I would like it to look like the second screen which I can only get when clicking through the images in the preview. Once I refresh the website it reverts back to the two images at the start on the home screen, which you can click through but i prefer it look like the second image from the start. Any ideas? Thanks!

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