In the Line chart, if there are more than one line, the Axis title will show the title and a marker box representing the color of the line. For example, if there are two plots (1. Employee Age, 2. Employee Salary).
The left Axis will have the two title and before each title a square colored as the line chart. This box is too small when screen capturing the visuzalizatoin. Also, it does not get exported when exporting the visualization. I have two suggestions:
1. allow size configuration for this box.
2. enable exporting the box with the axis title to PDF and other applications.