With the May 9, 2019, release, we will be removing the secondary left navigation to make for a cleaner, more organized user interface.
The two core buttons are the green "Create Workflow" button and the gear icon to that button's left. The Create Workflow button will lead you to the screen where workflows can be built and edited. The gear icon houses the global permission settings.
We hope this new look streamlines your workflow while you are working with Workflows!