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Description of your suggestion.
The EXP bar in the GUI screen for Levelz is non-standard, and so it does not fit standardized EXP bar textures.
To be more clear, it is 1 segment too short.

I also noted that many of the icons are not spaced very evenly, and crowd each other, making standardized button sizes very difficult or impossible to make.

The ? buttons are spaced differently from the + buttons and the highlighted version of ? is too close to the grayed out + icon, making it impossible to make the same button size for either kind of button.
The book buttons are very small and right next to each other, crowding each other and limiting customization space.

Make sure you are not opening a duplicate.
Description of your suggestion.
The EXP bar in the GUI screen for Levelz is non-standard, and so it does not fit standardized EXP bar textures.

To be more clear, it is 1 segment too short.
I also noted that many of the icons are not spaced very evenly, and crowd each other, making standardized button sizes very difficult or impossible to make.
The book buttons are very small and right next to each other, crowding each other and limiting customization space.