I have recently started using Illustrator on a Microsoft Surface, and intend to work predominantly in tablet mode. When using the curvature tool, if I want to finish an open curve, I would typically press ESC, but without a keyboard, I can't figure out how to terminate curve entry (other than by selecting a different tool, and then coming back). The surface pen buttons are not remappable to keystrokes, so I'm at a loss. Any help appreciated.