I covered this and more in a post over at Autodesk Community Voices blog. You might want to check it out.
Link: Civil3d: Leveraging Label Legerdemain a series ... "I Can See Clearly Now".
From The Post:
There is no setting or mechanism to control the Label Style Composer (LSC) background color.
The LSC Preview Window and Text Component Window inherit their background color from the tab that is current when the editor is invoked. The default C3D template uses a dark background for the model tab and a light background for the layout tabs.
I happen to use this convention. When I need the LSC, I pause and consider the label text color, make sure that a tab with an appropriate background color is current, then start the LSC.
Dark background (from Model tab) on the left and light background (from Layout tab) on the right:


Christopher Stevens
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