How do you open the left window in SQL Developer?

To open the left window of SQL Developer, you can follow these steps:

1. Open the SQL Developer software.
2. Select the “View” option in the top menu bar.
3. Choose the “Navigation” option from the drop-down menu.
4. Click on the “+” symbol icon next to the “Navigation” option.
5. The left window will open and display a list of objects such as database connections, tables, views, etc.

Please note that the name of the window on the left may vary depending on the version of SQL Developer, but should be similar overall.