How do you tidy up a lineup so it contains only the pages you care about?
Pages can be dragged around. If you move the cursor up above the page title, it will turn into the image of a hand. (If the page is long enough that the title doesn't show, you'll have to scroll to find the active area.)
If you then **drag up** so that the cursor crosses the upper boundary of the page, the image of the page will go grey. When you let go, that page is removed from the lineup. Try that with the page to the left of this one.
If you **drag left** or **drag right**, you can move the page to a new position.