Calendar is missing a view which would present all activities. Now I can choose 'All planned work times' etc, but instead of separate views I want to see all data in a calendar, so for example I won't schedule someone a task during a leave.
All views accessible in the menu can be configured. They are in fact saved filters. To create a new filter go to filter settings, set chosen parameters (in the case of a calendar filtering pick all activities and all users) then use 'save' button on top of th Filter Panel. You can save a filter as a new one or overwrite an existing one. Detailed description in 'Filters' section.