You need to click the small + icon at the bottom left corner, and select "Create Folder". TO manage the content of folders, you need to open Preferneces / Subsrciptions and then drag and drop subscriptions, lik e you do it with files and folders in Finder.
Category: News, Feedly, Feedbin, RSS
Compatibility: MAC OS X Yosemite, El Capitan
Leaf: News Reader for Mac OS X (Yosemite, El Capitan)

Leaf is an amazing news reader for Mac OS X (Yosemite, El Capitan). Read, share, star and search news from all of your favourite websites by using a clean, intuitive, OS X Yosemite, El Capitan-style next generation interface. Leaf is supported feedly and feedbin. Feedly App for Mac OS X, Feedbin App for Mac OS X