Opening a project

Let's open an existing project and take a look at the ArcPro interface. When you first launch the application, you'll be asked to sign in with your ArcGIS Online account (if you don't want to sign in each time, check Sign me in automatically).

On the opening screen, select Open another project. From the folder where you installed the sample data, select GettingStarted:

Once your project opens, it may look familiar to you if you use Microsoft Office. This is not accidental, but part of a collaboration between Esri and Microsoft. Across the top, you'll find the ribbon and tabs (Project, Map, Insert, Analysis, View, Edit, Imagery, and Share) in one or more panes. The panes and ribbon are context-sensitive and will change depending on what tools or features are selected. The bottom half of the window is still fairly similar to ArcMap. At the left is the Contents pane.

To the right is the Map View. (If you do not see the Contents pane, it may be turned off. To turn it on, click View|Contents). If you are familiar with ArcMap's interface and functionality, you may find the page http://pro.arcgis.com/en/pro-app/get-started/migrate-to-arcgis-pro.htm helpful: