Microsoft 365 (Outlook for iOS) - View multiple calendars at the same time

This document will provide you step-by-step instructions on how to view multiple calendars at the same time on Outlook for iOS
  1. Tap the Calendar tab to access your calendar.
  2. Tap the calendar icon next to the month designation located at the top left of the page.
  3. A sub-menu will appear showing you all the calendars you have access to. Place a checkmark next to the calendar you want to view and click anywhere to return to your calendar view.