“Screening” probably warrants a much more in-depth view but here’s a quick how to…

1. ctrl+p to bring up your plot settings
2. There’s an arrow in the bottom right.  Click it to expand your advanced menu.
3. Once that’s expanded you’ll need to edit your plot style (or make a new one)  Click the plot style table editor button (it’s a workbench and a wrench)
4. In this window you’ll see the Screening option. What you want to do is select the color of the lines that you drew and now want to fade out.  So if you drew your plan on the cyan layer (color 4) you’ll want to select that and change the screening for it.  Now when you plot, and have your plot style selected, it will “screen” that color for you.