UI layout and appearance is generally poor
#94 already addresses this, but it doesn't quite capture the nature of the problem, which is; the layout of the UI in Tweaks is generally quite poor. Issues abound. There's too much space in some areas and not enough in others. The layout doesn't scale. There's a lack of grouping and delineation. Lists are missing borders or backgrounds. In general the app doesn't follow contemporary design practice, which is clear when you compare it to Settings.
Tweaks is a popular application. This overall lack of UI quality reflects badly on the platform.
I've updated the Tweaks mockups today, and am happy to do any design work required to address this issue.