Changing the default view of your calendar is easy!
FROM THE WEB APP
Step 1: Go to Calendars.
Step 2: Click the settings 'gear' icon in the top right hand corner.
Step 3: Select 'Default View Mode'.
Step 4: Done!
FROM THE MOBILE APP
This setting is only available for the web app at this time. The default view mode on the mobile app is the 'Month View'.