The fixed value of 20GB root disk for the flavour drop downs [here](https://github.com/stackhpc/azimuth/blob/f222b6183f14cd8f1d1ac5dfac9a49166ae3289e/ui/src/components/pages/tenancy/platforms/kubernetes/form.js#L133) and [here](https://github.com/stackhpc/azimuth/blob/f222b6183f14cd8f1d1ac5dfac9a49166ae3289e/ui/src/components/pages/tenancy/platforms/kubernetes/form.js#L414) shouldn't apply if clusters are using boot from volume.
The fixed value of 20GB root disk for the flavour drop downs here and here shouldn't apply if clusters are using boot from volume.