The left pane shows connection details for the data sources you have connected to. This section allows you to add additional data source connections using the Add button. 

When connected to flat files (for example, Excel), the Connections section will show the Excel workbook you are connected to with the sheets listed here. In the preceding screenshot, Global Superstore Orders 2016 is the Excel workbook and the sheets are Orders and People.

When connected to databases, the left pane will display the server name, the database, schema, and tables listed in the following screenshot:

If you hover over the right of the connection name, a down caret will appear. This allows us to make extra changes to the connection, such as renaming it.

You can view records in any table that you are connected to by hovering to the right of the table name, then clicking the View data icon. This is shown in the following screenshot:

This results in the following popup:

If you need to go back to the start page, click the Tableau logo in the upper left-hand corner of the screen (under File).