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I'm afraid that there's curently no option to hide particular pages from the view in Page Manager. It'll always display all your pages and a scrollbar to navigate up and down. Page Manager was designed for offering an easy drag-and-drop option to arrange pages, and I admit that it may get tricky to manage a high amount of pages from there.
So I won't be able to offer you a quicker solution for managing your pages with the Page Manager. I'm sorry I don't have better news for you at this stage.