How To Sign In As A Different User In SharePoint 2013
November 2, 2015
For some odd reason Microsoft decided to remove the option to display the “Sign in as Different User” in SharePoint 2013.
The good thing is with just a quick change in the URL the you can get the site to reload with a log in box that shows for you to log in.
Hooray, no more Signing Out and closing the browser, and deleting your cache, and formatting windows and buying a new computer.
add the following string to the end of your URL:
Eg. http://SharePoint/ —> http://SharePoint/_Layouts/CloseConnection.aspx?loginasanotheruser=True
NB: This should only work on SharePoint 2013.