CorelDRAW X7 introduced a new tool called Smooth tool that helps jagged curves transform into smooth curves. Besides, it also comes with two settings to achieve desired results, Nib size & Rate. You can change values of both this settings in place while smoothing the curve. Hold the Shift-key and drag the curser up or down to increase/decrease the Nib size values or hold the Alt-key and drag cursor sideways to change Rate at which the effect is applied.
P.S.: This is applicable to most Shaping tools where Nib size & Rate commands are applicable.Tip provided by Pratik Shah, CorelDRAW Master, Graphic Designer & Trainer.