In the placemarks column there is often a problem with the description appearing below the placemarks spreading elements out more than you would wish. Using a blank snippet (you'll need to scroll down to find it) reclaims this space and snippets also allows other kinds of control.
Some of you may not know how to edit KML, if so read on: KML is a text file that Google Earth reads to render your data on screen. To use the snippet trick you will have to access your Google Earth file and edit it using a text editor, the details of how to edit KML are here . the construction