If you inadvertently delete or close the color palette that is normally on the right side of the CorelDRAW screen, getting it back is as easy as going to Window > Color Palettes and enabling Default Palette (or whichever color palette you want displayed).
You can also go to Window > Color Palettes > Palettes to open the Palettes docker. This gives you a list of all palettes and you simply check which one(s) you want displayed.
Learn more about color palettes in our full tutorial Understanding Color Palettes.
You can also find the CorelDRAW Q&A video here on the Discovery Center, where we answer more questions submitted by CorelDRAW users