Crosshairs indicate the cursor position on the Image Window while performing takeoff. The option to switch between the two crosshair modes is under Tools > Options. Check or uncheck "Use full-window crosshairs for mouse takeoff".
Using Full Crosshairs can make it easier to follow the cursor on the Image Window.
Example of normal crosshairs...
Example of Full-Window crosshairs...
When using a digitizer, full crosshairs are automatically enabled.
You can also set the color and thickness of full-sized crosshairs. See Program Options - General Tab (Adjusting How You Work with OST) for more information.
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