You can’t do any “freeform” drawing on Freeform on Mac OS. You can only use the pen tool for vector lines and splines. There is no pencil/marker tool.

I understand that a mouse or trackpad are not the best tools for drawing but many of us have used them for that since the original MacPaint app in 1984. Why remove this feature from the Mac version? Let alone for someone with a pen-based tablet.