Group issue board
Introduced in GitLab 10.0.
Group issue boards help users manage teams in organizations that have a team-centered or product-centered approach which spans many projects.
The design and functionality are the same as project boards with some small differences:
In a group board all issues within group projects will be displayed on backlog or closed lists. Users don't need to filter them by project on search bar.
Group boards can only have group milestones associated with them.
Only group labels can be used to create lists inside each board.
Only issues in immediate child projects of the group are available in the group board. Issues in further descendant subgroups are not shown in the group board.