Using this URL:
https://www.windy.com/-Menu/menu?radar,36.659,-77.582,7,i:pressure,m:eHlad1g
Notice the "i:pressure" in the URL?
This is the URL tag that is populated when the switch is turned on in: More Layers, Isolines of Pressure.
But, when I pass this URL into the browser the lines do not appear. When I am leaving the page for a different URL (Google, CNN, etc.) the Isolines appear for a split second. This has to be a bug.
All meteorologists want to see the pressures without having to drill down to a switch that is buried in the menu system. Very frustrating. I love Windy.com so don't interpret this comment as being negative, please. It is the best tool for weather that I use every day!