Is it possible to collapse the file tree in Cloud9?

Question

In the c9 editor is there a way to toggle/collapse the work-space file tree, preferably by using a keyboard shortcut?

I know that this is possible for a terminal console but was hoping the same for the file tree.

Answer 1

For collapse:

1. Click on the folder that you want to collapse in the Tree:

2. Then Alt + 0: