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Since you entered the Print module, you’ve been working with an unsaved print, as is indicated in the bar across the top of the Print Editor view.
Until you save your print job, the Print module works like a scratch pad. You can move to another module, or even close Lightroom, and find your settings unchanged when you return, but if you click a new layout template—or even the one you started with—in the Template Browser, the “scratch pad” will be cleared and all your work will be lost.
Converting your print job to a Saved Print not only preserves your layout and output settings, but also links your layout to the particular set of images for which it was designed. Your print job is saved as a special kind of collection—an output collection—with its own listing in the Collections panel. Clicking this listing will instantly retrieve the images you were working with, and reinstate all of your settings, no matter how many times the print layout scratch pad has been cleared.