To start working with databases in BI Studio, you should first create a BI project file which includes database connections and BI files.
After creation a project file, you can connect to the database host. When you connect to the database host, BI Studio will populate the databases and tables and will show you the Table Manager tab. To change the connected database; double-click a database then this database will become the current connected database.
The toolbar includes all important features and is divided into different sections, and changing the host connection will modify the toolbar.