From Longman Dictionary of Contemporary Englishtitle barˈtitle bar noun [countable] the coloured bar at the top of a computer window that shows the name of the program and whether it is being used at that time
Examples from the Corpus
title bar• Open applications can be dragged to a title bar menu at the bottom of the screen.• One call might evoke a window, with the standard scroll bars and title bar.• Likewise, a peek at a window framed by title bar and scroll bars is enough to evoke the sacraments of Mac. 