I got a laptop with small screen and high resolution. So I used the System Font Size Changer from wintools .info to make the fonts in Windows 10 bigger around the board, I changed from 9 to 11 to spare my eyes. So when I start Paint.NET the color picker looks like this. My first thought would be to make the window bigger and the problem would just disappear but it seems to not be size adjustable. Or even better, make it read the windows registry for palette titles and adjusts its size.