When your design contains coverage that is calculated in nT Coverage, then you can apply the custom layout (attached) that will show the percentage of the values.
Here are the layout parameters:
<FIELD NAME="ChannelCoverage" CAPTION="Cov" TOP="72" LEFT="5" WIDTH="60" HEIGHT="9" FONT_NAME="Geneva" FONT_SIZE="9" FORMAT="%.2f" SUFIX="%" TEJUST="C" >