Can't change freeform line color even by creating a new default template

I have tried 10 times (at least) to create a new default template with BLACK as the default color for the freeform line. I cannot get it to save. Ultimately, I end up with a new template and the same defaults (which is a blue line).

Please help.

The unfilled freeform line has the style “Default”. The filled freeform line has the style “Object without fill”. So you need to change these styles in the template, which of cause will effect other objects too.