Unifying calendars is a great way to see your schedule at a glance.
If you use Google or Outlook calendars, you can combine your respective calendars in Shift using Google's or Outlook's features.
Google makes it easy for you to share your own calendars and your colleagues!
Here is an article from Google on how to unify your calendars in Google Calendar.
Just like Google, you can unify your Outlook calendars together!
Here is an article from Microsoft on how to unify all your Outlook calendars.
At the moment, Shift does not support the ability to combine both Google and Outlook calendars together.
If you'd like to see a fully unified calendar feature in Shift in the future, you can send in your feature vote here!
Your vote helps us prioritize the future feature development of Shift, so please let us know.