Thank you for all your responses.
This fixes it. It is funny how I thought of hunting down the pid for enpass to manually kill it but did not think of pressing the escape key.
As seen in the screenshot, I don't have a close button for the application. I think I had the close button in Gnome, but cant seem to find it now.
Arch Linux
Cinnamon 3.2.8-1
Enpass 5.4.1-1