One of the small UI Improvement of Visual Studio 2015 IDE was main ‘Title Case’ Menu Bar Style instead of the ‘All CAPS’ Style. And, the ‘Title Case Style’ set as by default for Visual Studio 2015, where as for all the prior version of Visual Studio had only ALL CAPS Menu Style Option. In case if you want to revert back the menu style to ‘ALL CAPS’ from ‘Title Case’ , you can turn On/Off the ‘Apply title case styling to menu bar’ from Tools –> Options –> Environment –> General
Default Menu Bar (Title Case) of Visual Studio 2015
ALL CAPS Menu Bar of Visual Studio 2015
P.S : I personally prefer the new Title case Style. This was a quick tip to know that, there is a way to getting back the old menu style as well.