On left hand side you have a panel consisting of a couple buttons. ONe of those is for static pages where you can see all static pages and when you hover a static page you will see a little scroll wheel to the right side. when you click it you will have an option in top right corner to draft the page.
If you want to take down only one cms item you need to navigate to cms panel, find the right CMS and then select the page inside that you want disabled. You can then draft it or archive it to take it offline