The completed items on your setup list

What you have already done collapses into a list at the bottom, so the open items stay at the top where they are useful. Open it when you want to check something actually saved: if an item is in there, the site has the content, not just the form. It is also the fastest way back to a page you set up months ago and cannot remember the name of. Items move into it on their own; there is nothing to tick.