How do I fix this issue in drawing canvas?

I'm facing an issue with drawing in drawing canvas. If you download my attached file and preview it then

first draw outer circle around small circle then draw over small circle.

look at the edges of the small circle there are 2 things happening.

1) edge are overlapping however I didn't make small circle large then the hole of bigger circle. they are almost same sized. but while drawing it looks like small dot's size is bigger than bigger circle's dot.

2) edges are being sharp.

I think smooth edges is the reason for both the issues.

is there any way we can avoid both issues?

Construct file