The Coordinates bar, as its name indicates, deals with various aspect of coordination in the document. Page display, page selection and frame sizes are the most important headings here.
The Coordinates bar is a real window, so it can be moved. You can activate the window with a click on the vertical bar at the left of the Coordinates bar. The bar will then turn grey. If you keep the mouse button held down over the bar, you can move the Coordinates bar window to any desired position on the screen.
Tip: A double-click on the active bar shrinks the window
down to the size of the bar. This may be desirable in some situations
to win even more space on the screen to display other things. A repeat
opens the shrunk window once more.