Google released a new graphical design for their Calendar app.
It’s now available to switch to this new interface, from the web app, select “Use New Calendar” in the top right hand side.
No new features, just a design clean up. It is much easier to access/browse resource calendars (conference rooms) now though.
This article describes the new changes: https://support.google.com/calendar/answer/7541906?p=calendar_web_new