Feature request: Collapse all folders

Hi folks. A simple little feature request to have a button or keyboard shortcut to expand/collapse all folders in the sidebar at once.

In a larger doc with lots of folders and subfolders, it can quickly be messy and overwhelming in the sidebar and a bit tedious having to collapse folders to get back to the main view.

Or, perhaps a default state option of opening the doc with sidebar folders collapsed?

Just thought I’d put it out there!