I would add: don't do that in KiCad. Although they added the functionality, it's clear that they never really QA'd it. It's profoundly broken. Many simple shapes are impossible to achieve, adjustments are painful and often require redrawing the entire track, selection boxes are not calculated correctly so you end up accidentally selecting curved tracks that are inches away...

If you want to design boards with curved traces, paying several hundred bucks for DipTrace is almost certainly a better route.