Hi there,
DScan’s purpose is to give you an indicator of what may be near (within 14 AU) your ship.
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Dscan can be accessed by pressing Alt+D. To reduce the amount of screen space that Dscan requires, when you next have the window open, look for a button on the top left panel that looks like a square inside of a square. Click this and close the larger window, this should leave Dscan open and close the probe window.
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Take a look at this guide on the Directional Scanner from Eve University .
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To filter your Dscan results, simply chose an overview preset from the drop-down box in the Dscan window