The first section lets you change the color scheme of the Current At Bid / Ask Depth Columns.
The other settings are:
Clear current trades at Bid / Ask every X seconds - This feature will clear the Current Trades at the Bid / Ask at the selected time interval. To activate it, check the checkbox, select the interval and click Apply.
Text Orientation - changes the text orientation Left / Right.
Current at Bid / Ask Histogram - This checkbox will turn on/off the Histogram.
Tail Background Colors - Changes the color scheme for the Momentum Tails
Tail Inside Bid / Ask Fore - Inside foreground Momentum Tail color.
Tail Inside Bid / Ask Bold - Check if you want the inside Momentum Tail font bold.