How do I get rid of this gap?

Scrivener Scrivener for macOS
1

How do I get rid of this annoying gap above the “Collections” in this project, please?

[attachment=0]Screenshot 2021-04-11 at 20.14.30.png[/attachment]

2

Hover your mouse pointer exactly over the line under the word “Binder” and drag UP.

Hope this helps!
[attachment=0]Screenshot 2021-04-11 at 20.14.30.jpg[/attachment]

3

Thanks!