The Overview map by default is located in the upper left corner of the map.
You can navigate within the Overview map:
•Pan by keeping the current scale by simply clicking on the desired new location in the Overview map
•Zoom by drawing a rectangle box using the mouse (press left mouse button and release when you have finished the box)

Overview map
You can maximize/minimize the Overview map:

Maximize/minimize Overview map
You can move the Overview map by dragging it using the Move button:

Move Overview map