Rune,
Thanks for all of your work on this. I know from personal experience the effort and dedication that something like this requires. When I bought my NanoVNA, I had no idea that I was "surfing" the early adopters wave. I am a recently retired electrical engineer and the intellectual stimulation has been welcome, especially when dealing with a well designed software application like yours. The "bleeding edge" apps are not always this well thought out. It is quickly getting to the point where the first digit of the version number can be an integer greater than zero.
I do have a suggestion....
I have a 4k UHD monitor and one of the issues that I have is that most apps use fonts that have a single pixel stroke width which can be quite hard to read. I know that you have a font size option, which helps, however, I found that simply going to the Bold version of a font can widen the font stroke width and make big improvements in readability on a UHD monitor without changing the font size. Perhaps, you could put this option on your to do list for a future version.
73
Logan, KE7AZ
KE7AZ