Viewing multiple calendars at one time is easy!
FROM THE WEB APP
Step 1: Go to your calendar.
Step 2: Click to select / deselect user's calendars on the left.
Step 3: Done!
Time Saving Tip: 'Shift + Click' to jump from one user's calendar to the next.
FROM THE MOBILE APP
Step 1: Go to Menu > Calendar
Step 2: Tap the 'User' icon in the top right hand corner of the header.
Step 3: Select the user's calendar(s) you want to view.
Step 4: Done!