Filters - allow to set negative filter
Filter only allows us to select projects or project groups to be shown. There should be a feature to allow certain project groups or projects to NOT be shown. The disadvantage of the former is that new projects will have to be selected every time they get created-- if we forget to select them in the filter, they will not be shown in the task board, possibly missing out on them.
If we have a negative filter, the new project or project group will automatically be shown because they do not meet the criteria of the negative filter.
The is useful if we do not want to show active project templates in the task board.