The window Title Bar contains a description of the window, and the window minimize, maximize and close commands. Title Bars may be viewed in Normal or Small mode, or may be hidden if you are trying to free up additional screen space. Title bars may be viewed or hidden on individual windows, or you may make a global change to set all window title bars the same.
To hide or display a window's title bar
From the Window menu, select Title Bar, then select Normal, Small, or Hidden.
To hide or display ALL window title bars
From the Window menu, select Make All Title Bars, then select Normal, Small, or Hidden.
Normal:
Small:
Hidden: