The Project list is a screen that shows all registered Projects in astah* share. Projects are what you first need to create when you start astah* share, then you can add .astah files to the Project to get them on astah* share.
In astah* share, Project is a top level concept and a folder that holds multiple project files(.astah). Project is essential to use astah* share. For how to manage Projects (Create, Modify and delete them etc), please refer to Project Management.
There are two ways to open a project.