oPerspective is a premium section that provides various lens for viewing your data. For example, a view into your entires by year, by month, by city, country. etc.
To access this section, navigate to Menu/Perspective. New users are allowed 25 free previews to this section to give them a feel of this feature.
Pespectives on Mac is spread into multiple menu items on the Sidebar. For example, to view entries by year, you drill down under the Timeline menu.
Similarly, the Atlas perspective that displays all your entries on a map is accessible by clicking on the Atlas menu item in the sidebar.
The Health perspective provides a view into your health and mood entries group by month and year. There an option to even print this as a PDF report so that you can takeit with you to the doctor.