When you mouse over the + icon on the left side of a feed group (the one you click to open it and see the list of feeds within), the mouse cursor changes to a text entry cursor (looks roughly like a | symbol). I don’t know if it’s possible, but I think leaving this cursor as an arrow, or better yet, changing it to the hand icon with a pointing finger that you get when mousing over article titles would be a welcome change.
OS: CentOS 7.6.1809
PHP: 7.0.32
DB: PostgreSQL 9.2.24
Browser: Edge 44.17763.1.0