Change amount of sections in arc/circle

SketchUp - YouTube search?query=circle

E.g:
CircleTool - Square One - YouTube

However SketchUp does not “play nice” with such a small dimensions (edges). Better to scale the model up by 100-1000, and when you done you can scale down again.
(Also see : https://forums.sketchup.com/t/the-dave-method/49720 )