Corner shape option does not show default curve - could we set the default curve?

[Boldline]

In build 65, if I create a square or rectangle shape and then convert to curves, when I click on the corner shape option in the contextual menu bar, it does not show any as highlighted. I can choose an option there and that option remains with that shape - but each time I make a new rectangle/square shape, I have to edit it again. I don't mind this, but is there a way to set it to something by default and then allow for unique cases where it changes for unique shapes?

[VectorStyler]

@Boldline Yes, at this phase it does not yet has any corners. First you must set a nonzero corner radius.