With Wunderlist 2 we introduced Smart Lists.Smart Lists are special lists that automatically filter your to-do items, such as showing only starred items, those assigned to you and those due today, or items due within the next week. Wunderlist also has Smart Lists that can show all your items or all completed items.
To activate Smart Lists in the web and desktop apps, open your Account Settings by clicking on your avatar image and choosing the "Sidebar" tab.
In the iOS, you can change your Smart List settings by choosing “Edit” in the bottom left corner of the List view. On Android you can open the list settings by performing a long press in the List view. You can set a Smart List to “Auto”, “Visible”, or “Hidden.” The “Auto” option sets the list to show only if there are items in it, while “Visible” means it will always show (whether or not it contains items) and “Hidden” means it will always be hidden.