Click the Set as default to choose which calendar will be displayed as your default calendar.

The Views tab will display the chosen view type in the preview pane. If you leave the Views tab, the default view you selected will automatically be displayed in the preview pane. The calendar configuration and default view will stay unchanged. 

To show a dropdown view selector  in your calendar's header for users to choose the view type they want to see, simply click the Disabled/Enabled button toggle at the top of each view's settings panel. This is a paid plan feature requiring a professional plan or higher.

‍