What is Google Calendar's new interface?

Here are some key differences between the "new" and "old" designs:

Add rich formatting and hyperlinks to your Calendar invites
 

        Link to relevant spreadsheets, documents or presentations in your Calendar invite and
        open them directly from the new “Event Detail” view.

 

Manage multiple calendars side by side in “Day” view

 
  1. You can view and manage calendars in separate columns. This makes it easier for employees who manage multiple calendars, like administrative assistants, to schedule meetings on behalf of their teams.
  2. Click “Day” view and select the calendars you want to compare.
     
Other changes

 
  1. Now you can see contact information of meeting participants when you hover over their names in a Calendar invite.
  2. There’s also a new way to view and restore deleted items in one place in case you accidentally delete a meeting.
  3. Additionally, "Day,” "Week,” and "Month" views are more accessible, featuring better compatibility with screen readers.

 

Warning:
Some Chrome extensions for Google Calendar may not function in the new interface.