1
If you have replaced the color cartridges in your printer, clean the print heads on your printer a couple of times to test of it then prints in color.
2
If that does not resolve the problem, open the Settings App.
Go to Bluetooth and Devices - Printers and Scanners.
Select your printer.
Check the Printer Properties and Printer Preferences section to ensure that it is not set to print in Grayscale or Draft Mode.
3
If that does not resolve the problem, uninstall your printer, restart (not shut down) your PC, then go to the support page for your printer on the manufacturers website to download and reinstall the version of printer drivers, firmware and associated software they provide.