Please help, which caused me great distress, thank you very much to help

When DraftSight Printing color cannot be set to black and white

Please refer to Annex Videos

1. In printer menu select Additional options。select monochrome.ctb (Namely can be printed in black and white)

2. However, only monochrome.stb, you can not select monochrome.ctb

3. Focus is, monochrome.ctb and monochrome.ctb are stored in the same path

4. Why can not choose monochrome.ctb ?

Cause Printing color cannot be set to black and white