Bwsh:
If you set the Part-attribute SECTION-COMPONENT = NO on your fasteners, they will not be sectioned in any drawings / section views.
You can then override this attribute in any drawing , if you would like a specific fastener to be sectioned.
Either when creating the section view - Sectioned Component / Solid,
or when the view has been created Edit - View - Section in View...
You can also fastener by fastener set the No section in drawing by drawing, but it's smarter to set the attribute as default.
In this case, i assume that Cubalibre had the desire to present the nuts non-sectioned but the pin sectioned.
Regarding the Hidden Line Hatching, See the attached image for an example where it can be used.
Upper View Off, lower view On.
Regards,
Tomas