When I see the screenshots on Github then I have to conclude that my code editor looks a bit different:
Between the "Open file" button and the "Save file"-button in the left top corner of the image should appear the "Project/folder"-button. I can toggle the sidebar, but that is not useful without a project.
This code-editor came with elementary OS and I did not install it myself. Do I have to uninstall and install it again to get this functionality? Or do I need to install a plugin?