The coordinate axes show the location of the origin and direction of the positive x-axis of the coordinate system. The origin is at the intersection of the axes and the positive x-axis is indicated by a tick mark near the origin. The positive y-axis is always 90 degrees counter-clockwise from the positive x-axis.
A grid overlay can be displayed along with the axes to show the entire x-y plane. Grid options include color and opacity.
Display the axes by clicking the axes button 
on the toolbar. The pixel position of the origin and the angle of the +x-axis (measured counterclockwise from horizontal) are shown on the toolbar.
Select and drag or nudge the origin to a desired location in the main video view. Or enter the desired origin pixel position in the toolbar field.
Select and drag or nudge the positive x-axis to rotate the axes about the origin (hold down the shift key to restrict angles to 5 degree increments). Or enter the desired angle in the toolbar field.
Check the Grid checkbox to display the grid overlay. Click the grid options button 
to change the color or opacity of the grid.
Locking the axes prevents it from making any changes to the origin or angle. Lock the axes by turning on the Locked property in its track menu.