In the new UI of SharePoint 2013, there is a new button in the top Sharing bar called “Focus on Content” which lets you highlight the Content area by hiding the quick Launch or Left Nav on the page.
All you have to is click on the rectangular button with tooltip Focus on Content on a page and that will hide the quick launch.
Here is the Before-After for clear picture.
One of the things to note is that if the user clicks on Focus on Content and comes back after leaving the page the setting remains intact.
SharePoint 2013 Top links – Name, ID and How to Hide them
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