Just an idea.
I can't tell you how to change them (I'm a SolidWorks user) but, look in the Print dialog box at the bottom - Additional
Options - Print Style Table. There is an Edit button too. Mine is set to monochrome.ctb and prints in black and white.
Also, they are located in Program Files - Dassault Systemes, Default Files, Print Styles.
Hope this points you in the right direction. Sylvia