Create folder button in Roadmaps Overview section

What is the challenge?

My coworker and I struggled to find the right button to create a new folder on the Roadmaps -> Overview page. The design doesn't seem super intuitive; instead of having a "Create folder" button up top (or similar) users have to find the small + icon on the left sidebar. See current location highlighted below.

What is the impact?

It is difficult to find the right way to create folders in this section.

Describe your idea

Add a more visible "Create folder" button (or similar). I added the location I looked for the button in the screenshot.