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This article is related to below post where user reported missing ribbon issue after migration from SharePoint 2007 to 2013 version. https://social.technet.microsoft.com/Forums/en-US/628b9f7b-b1e7-4bb1-b01d-fcb11b252862/ribbons-missing-after-migration Scenario: Ribbon not visible on SharePoint List/Library page load. Mostly reported after site migration from 2007 to 2010/2013 version. Also if you have added a content editor web part on this page. Cause: When content editor web part is added to standard list/library pages, classification of page changes from List View page to Application page. Solution: First of all, if you are experiencing this issue after migration, perform below checks- Check if this issue appears for existing/new list/library pages. Is it happening for all lists/libraries If item in a list/library is selected, ribbon appears? Any customization  like Content Editor Web Part or JavaScript  code added on that page....

Today I was asked to hide the quick launch on a SharePoint 2013 page.  The easiest way to achieve this was to use the Script Editor web part with the following CSS: <Style Type="Text/CSS"> /* — Hide the quick launch — */ #sideNavBox { Display: None; } #contentBox { Margin-Left: 10px } </Style> So this: now looks like this: