When users are describing their preferred interface in Corel PHOTO-PAINT, I hear a big divide on one specific aspect of the interface. Some people prefer to work with one of the defaults and that is to leave the Mask Overlay turned on. Others either are frustrated by the overlay or they have switched it off.
There isn’t a right and a wrong way to do it, only your personal preference. If you find it easier to work with the pink overlay, the default is perfect. If you’d prefer to have marching ants delineate your mask, select Mask | Mask Overlay and turn it off (no checkmark next to it). You can also change the color of the overlay or of the mask marquee (marching ants) by selecting Tools | Options and going to the Display section. The key is finding the settings that make you the most productive!