Think I figured it out for the Mac to get a larger display for the 4k screen on a Mac. Font was way too small for me. so I went to System Preference on the dock, chose display, scaled and chose larger text the first and second choice gives you the best for working in the program. I have not had this issue in windows, but only for my new 4k Mac, but these steps fixed it. Working with Mac OS Catalina 10.15.6
I agree the pencil tool needs more refinement for free hand drawing and more smoothing and editing would be great, since I too use this for freehand sketching of patterns.