Tree-style tabs lets you close an entire (sub)tree of tabs at once, should you choose to do so. It's also useful to start new projects in a new window, and let

Tree-style tabs lets you close an entire (sub)tree of tabs at once, should you choose to do so. It's also useful to start new projects in a new window, and let the tree structure build up in that as you progress. You can close parts or all of that window as you've concluded with them.