We've moved the majority of the old menu options into the new hamburger menu that you can open via the icon in the top left hand corner.
Weather has been moved here and you can access the weather page by tapping on the weather image. Search, preferences, and help has also been moved to the hamburger menu.
You can quickly switch between views via the hamburger menu, as well as set your default view by choosing the star to the right of the view name (this is the same option as in the preference menu > general > default view)
If you scroll down you can also choose which calendars you want to set as visible/not visible. For more in depth options, tap the configuration icon to choose which calendars to sync, set custom names for calendars, and pick a calendar color for each calendar.