How do you display the left window in Oracle database?

In Oracle database, the content displayed in the left window depends on the tool or client you are using. Here are some common Oracle database tools and their corresponding left window display content:

1. The left window in Oracle SQL Developer typically displays a list of connections to databases. In this window, you can add, edit, and delete database connections.
2. SQLPlus is a command-line tool provided by Oracle, usually not displaying any content in the left window. You can input and execute SQL statements using the command line.
3. The left window in Toad for Oracle typically displays a list of connections to databases. You can add, edit, and delete database connections in this window.
4. In most cases, the left window will display a list of connections to the database. You can add, edit, and delete database connections in this window.

Please note that different versions and configurations may cause slight variations in how the window is displayed. These are just some common examples, and there may be other tools and configurations in use.