In the compact view
  • Have a link from categories to the expanded budget view with that particular category selected.
  • Hide categories with '0' budget but keep categories with 'no budget'.
  • Allow folding categories (and thus hiding subcategories) with a single button.
In the expanded view
  • Show the status of the categories next to their names, where status can be "This month's budget" or "Difference" as seen in the Compact view.
  • Also allow hiding zero-budget categories