How to set monochrome plot settings in nanoCAD?

Kindly check monochrome.ctb is set in the following:
1. Inspector - Plot style table - monochrome.ctb
2. File - Plot - Plot style table - v Color Plot Mode, style is monochrome.ctb


If it doesn't help, make sure that every color has Off graystyle in Plot Style Table Editor (File - Plot style manager - monochrome.ctb - OK - Form View).