Here is what the buttons do:
- Active Filter: View only Active items. This hides all items that are not of type "active".
- Due Filter: This filters your list to show only item items with due dates.
- Focus Filter: This filters your list to show only items marked with focus mark.
- Completed Filter: This is toggles showing completed items or hiding completed items
- Open Outline: This icon opens all the projects in your view
- Close Outline: this icon closes all outline items in the current view.