...
Power BI Desktop is installed as an application, and runs on your desktop.
When you run Power BI Desktop, a Welcome screen is displayed.
You can Get Data, see Recent Sources, or Open Other Reports directly from the Welcome screen (from the links in the left pane).
If you close the screen (select the x in the top right corner), the Report view of Power BI Desktop is displayed.
There are three views in Power BI Desktop: Report view, Data view, and Relationships view. Power BI Desktop also includes Query Editor, which opens in a separate window. In Query Editor, you can build queries and transform data, then load that refined data model into Power BI Desktop, and create reports.
...