Clicking on the gear icon (Details) will bring up a details view similar to the normal Assignment Details view.
Clicking on one of the colour tags in the lower left corner will bring
up every assignment of that state to the right. From here you can take
action to approve all of the blues (turning them green), cancel all of
the blues (turning them red), or cancelling the shifts entirely (turning
them black). You can also manage any of the individual assignments as
normal from the Scheduler.