An Outlook had a question about the Calendar overlays:
I manage 7 calendars in Outlook and I would like to have at least 6 of them overlapped in the same view, but when I select the 5th, the view changes to something different. Is there any way to view more than 4 calendars overlapped keeping them as when I overlap 2 or 3.
That "something different" is the Schedule View. It's supposed to make it easier to view a large number of calendars. By default, when you select 5 or more calendars, Outlook switches to the Schedule view.
You can view more in the overlay mode. Either switch back to Month or a Day view on the View menu by choosing Month or disable Schedule view in File, Options, Calendar. If you like Schedule view, you can change how many calendars are selected before switching to or from Schedule view.
The settings in Calendar Options are:
Automatically switch from vertical layout to schedule view when the number of displayed calendars is greater than or equal to [number of calendars]
Automatically switch from schedule view to vertical layout when the number of displayed calendars is fewer than or equal to: [number of calendars]
Administrators can use group policy to allow or block switching between the standard calendar view and schedule view. In the Outlook Group Policy templates, the Schedule View options are under Outlook, Outlook, Options, Preferences, Calendar Options, Schedule View.
While we’re discussing Schedule View, a client preferred using Schedule view but thought it was “broken” because very few of his appointments were showing on it. A little investigation showed that most of his appointments were set to Free. By default, Schedule view only displays appointments that are marked Busy, Out of Office, Working elsewhere or Tentative.
If you use Schedule view and want to see Free appointments, you’ll need to enable the option for When in Schedule View, show free appointments. Or set your appointments to one of the Busy states.
Switch between overlay and side-by-side mode:
Or, right-click on the folder name and click on Overlay to toggle it on and off.