I never understood that dialog. Like the first 4 radio buttons seem to indicate there are only 4 values you can change, but then there's like 15 colored boxes in a horizontal line under that? I don't get it.

The 16 colors are the color table - these are the actual colors you want to change.

The selected box (of the 16) has it's values displayed on the right. Change those numbers to change the color's value.

The radio buttons select which of the 16 colors is the "default" for that setting. So you probably want to leave "Screen background" on black (the first color table entry) and you'd likely want to move "Screen Text" to white, the 16th entry. The popup colors are only really relevant for cmd.exe.

Yes, we're aware that dialog is garbage. I hate it to death. It's high on the backlog.