You can see this tool installed under Extensions menu
Once clicked it will bring tool window which you can place at your convenience
Workspaces managed by solutions and stored in .workspaces folder as individual json files. You can store those files in source control and use them for collaboration as well. Workspace name is used as filename so be careful with characters. Input validation is not in place yet. When you create new workspace open files will be loaded automatically. You can update open files in existing workspace by refresh button.