The Project Explorer is your Work Zone browser for each project. It will list all your Work Zones and sub-Work Zones so you can select them.
You can resize the Project Explorer from left to right if you happen to have long Work Zone names:

You may collapse or expand all Work Zones:

You may close the Project Explorer to leave more space for the main window, or open it again:
To create new workzones, you can click on the green folder at the top right corner. This creates a sub folder within the folder that you currently have selected in the Project Explorer.
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