Black Glass Nova with Kodi 17 Questions

I downloaded the new version of Kodi on my computer, a few weeks ago, and am using Black Glass Nova as my theme and love it. However, I can’t seem to change the highlight colors. I know where to go because I use the same theme for Kodi on my TV, but after I click “custom color” there’s still no color options. Am I doing something wrong? Or does that feature not work with Windows 10?

Also, if I updated Kodi on my TV to 17, would the option to use fullscreen or not be available? Or is that only an option because it’s on my computer?