I've tried over and over again to get the worked area to pop up in my HUD with no luck..? i've tried switching keybinds as well.
Update: I downloaded the map you mentioned, and I get both the yield meter and worked area meter on my end. I'm going to need a little more information for me to figure out what is happening on your end. If you want, you can message me at https://www.facebook.com/ThundRFS and I will help you figure it out.