We can apply corner rounding to rectangles from the Property bar all at once or, use the input boxes for a custom rounding of corners individually. You can also apply round corners to rectangles by simply dragging one of the corner with Shape tool (F10). However, this will apply even rounding to all four corners. What if you wanted to apply custom rounding to all four corners using manual mouse drags? Well, you can! Hold the Ctrl-key and drag the relevant corner!

Tip provided by Pratik Shah, CorelDRAW Master, Graphic Designer & Trainer.