Raylib is great but it has some problems. One of the biggies is it can’t spawn a sub-window.
What I did was create a non-blocking tcp listener that receives updates via a local dynamically generated page. When you click on configure it just opens a local browser whos pages use fetch to immediately update the WindowState (Ties to frame rate, 60 updates a second) of the Raylib app.
It works even better then I thought It would.