RadarChartView size

I am trying to replicate this design:

[![enter image description here][1]][1]

I'm sort of getting there, but the chart is rendering itself way too small:

[![enter image description here][2]][2]

I'm expecting the chart to fill the entire with of the screen, and use all the vertical space (to the legend, which is in its own cell outside of the chart).

Any ideas?

[1]: https://i.stack.imgur.com/mhBpo.png
[2]: https://i.stack.imgur.com/nSNHO.png