The Overview panel displays the entire drawing in miniature. The primary purpose of the Overview panel is to quickly zoom and scroll through the drawing while seeing both the full drawing (in Overview) and whatever detail (in the Drawing Window) that you are working on.
Select Tools | Show Overview Panel from the pull-down menu to open the Overview panel.
In effect, the Overview panel combines both the Zoom and Scroll functions into one view management tool.
Use your mouse to drag the Overview panel to an out-of-the-way spot on your screen, and then use it to zip around your drawing with ease. The Drawing Window will show a close-up of any point you click in the Overview. This tool is especially helpful with large or complex drawings in which navigating around the plan can be tedious or time consuming. If you have a large monitor (and your screen display can be set to greater than 1024.x768 pixels) the Overview panel is especially handy.
Important:
Using the Overview panel does not disable the visibility (zoom)
controls in the Top Button Bar: You may use either control while working.