Multipage website project disappeared

I'm new to Express; full premium member. When navigating website templates, I somehow found a library of a ton of examples from other creators. One had a home page of multiple squares, with images inside each square, and a caption below. Once you clicked on the square photo, it took you to a second page with an image on the left, and text box on the right. It was perfect. I customized three of the boxes, and added text to second page (once you clicked on image), and then I left the website page up on my computer for a day or two. One of the kids closed it - no issue since it saves as you go, but when I opened it, the template was a single page - completely different looking project. 

I can't for the life of me recreate the page, and there are no "public" templates to scroll through for websites. I only see thr dozen or so templates they provide. I need help! Online is says Express can't create a multi-page website, but then why did I see it, grab it, edit it earlier.