There may be pages in your site which are seasonal, that you would like to keep for the particular season/period, but not display during the rest of the year.
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There is no turn on/off feature. However you can login to the admin page of your site (admin.php) and first create a link to the page that you want to unlink from the site. After you establish the link to that page from admin page, you can delete the link from the site and then when you want to put it back, you can create it and use the existing page option and link to the one in the admin page.
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Links created from the admin page wont be visible in your site navigation, no one can browse to the page from anywhere in your site.
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​Note : Always first create the link from somewhere and then delete, in order to keep the pages active , reversing the order wont work.