Blue horizontal line on cumulative profit graph

[:::grimReaper:::]

What does it represent? The average of my cumulative profit as seen on the last day?

Is it possible to remove that? I may be required to show my graph to someone, and even though the y-axis clearly states pnl, I don't want anyone to get the impression that the blue line is the 0 line. People associate horizontal lines on a pnl graph with the 0 line, and I don't want them to be fixated on the difference between pnl and the blue line, rather the pnl and 0 line.

Thanks!