Collapse all chapters in outline sidebar

[versluis]

I’ve been getting into the iPad version of Storyist 4 and was wondering if there’s a way to collapse all chapters at once. When I open my document they’re all open by default, and it makes it slightly cumbersome to collapse each one individually, or scroll to the bottom of the list. I guess the list would look shorter when they’re collapsed. I’ve attached a screenshot if the area I’m referring to.

Thank you for any tips!