I could just be an item of its own, instedad of a subitem.1. It doesn't fit anywhere in the configuration
It works fine here in 32bit TC with and with XP-themed background:
https://tcmd.madsenworld.dk/nohorizontallines32.png
https://tcmd.madsenworld.dk/nohorizontallines32themed.png
https://tcmd.madsenworld.dk/nohorizontallines32Win10.png
https://tcmd.madsenworld.dk/nohorizontallines64.png
Of course I have to use another color for the lines when I enable XP-themed background