The Status bar includes buttons that turn on and off various features.
For example, this is where you can conveniently turn on and off the grid display, grid snap, object snap, dynamic input, and so on. The status bar also includes controls to display lineweights and object transparency. Several controls relate to the annotation scaling feature. 
One of the most important controls on the status bar, highlighted in the illustration, changes the drawing area between model space and paper space layouts.
Click the disclosure triangle at the far right end of the status bar to display the second row of controls, which include settings and operations for 3D.
The size of the icons and controls on the status bar can be adjusted by using the Tool Set & Status Bar Icons slider on the Look & Feel tab of the Application Preferences dialog box (OPTIONS command).
Cmd-6 turns the status bar on and off.