Aha yeah sorry, first post!

So here is my Popup Window, with the rect size at its current minimum of 240. I can't get the width of the window to go any smaller than that, but anything above that scales fine.
Here is the Popup Window with a smaller title, and a new minimum rect width of 161. The minimum width of the entire window is restricted by the length of the title string, which is fine in theory, but the header width is still way higher than I would like it to be. Ideally the red window header would have only a few pixels of border space either side of the title string. The rect HEIGHT can be resized all the way down to 0 with no issues.
The scene itself is using the default values of a theme I am currently in the process of designing, trying to get to grips with the theme system in general, so I thought it might be some value in the theme that I am missing?
Thanks!