For segmented copy number data, use the SEG or CBS file format.
By default, IGV displays segmented data as a blue-to-red heatmap where the data range is -1.5 to 1.5. If loaded segmented data appears in tracks colored all red, check the data values and modify the data range as necessary.
To change track display options, use the track pop-up menu. The commands that appear in the pop-up menu are those relevant to any data track.