Suggestion : Level Panel Design

I feel the level icons in the level panel disrupt the visual hierarchy between main levels and sub-levels. I think Removing icons altogether, as in Rhino, creates a clearer visual hierarchy, making it easier to quickly identify the main levels. Or at least there should more gab between main level and sub-level.
Thanks

Thanks for the suggestion @Steven_Kim , but I’d like to know more opinions about this before we consider any change. I personally prefer the icons in that dialog, and I don’t think removing them will make less or more confusing to understand the hierarchy of buildings-levels-subLevels. Actually, I believe that the icons make it easier to quickly see what’s a level and what’s a sub-level.