When Apple released iOS 7 late last year, the overhauled user interface included tweaks and changes throughout the entire operating system.
One such change was the removal of the ability to view your daily agenda from the month view in the Calendar app. As it was in iOS 7's month view, you simply saw a dot on each day where something was scheduled. To view the agenda, you had to tap on the day, opening another screen. This lead to a lot of tapping and navigating just to view your agenda for multiple days within a given month.
iOS 7.1 added a minor tweak the to month view in the Calendar app -- the ability to view daily agenda's without having to switch screens.
You might have noticed a new button at the top of the screen when you launch the Calendar app after installing iOS 7.1. The new list view is enabled by tapping on the button. Seriously, it's that simple.
After tapping on it, the bottom third of your screen will display the agenda for the respective day you've selected. You can switch days and move around as much as you'd like, without having to tap through multiple screens just to get back to the month view.
Be sure to read Sharon Vaknin's post, where you can find more tips to get the most out of the changes in iOS 7.1.