The Bid/Ask Depth Columns display pending orders on either side of price are patient participants comprised of small, large, and algos of whom constantly add, remove, and modify their orders the adjustments of which increase in busier market conditions

The Bid/Ask Depth Columns display the pending purchases and sells for market participants into their own respective columns.
We can customize these columns through the settings menu on the columns dropdown found there to change the Bid Depth and Ask Depth Columns
-The Font color of the Text and its Alignment
-The Total font color found at the bottom/top totaling the entire pending volume
-The Background of the entire column
-The Background of the Highlight for the histograms
-The Button to show/hide the Histogram
-The Histogram Orientation to the left or right