I am not sure about the pixel preview issue but it does get fixed when you restart the app. If i see it again I will let you know. Good to know about the other options! I will check those out.
Okay I figured it out (the preview brush size glitch)…. it’s not the freehand draw tool but the Draw Line and Draw Circle tool. It seems to happen consistently when you switch between the two and after you make the first stroke. I posted a Canva video here so you can see. Hope that helps.
