OrgChart control – Customize styling in UI for ASP.NET Core

I am trying to customize the default presentation of the image of the standard image displayed in the various nodes.  I can see that it is defaulting to “full rounded” whereas I would like to use medium rounding.

Can someone point me to how I can accomplish this?  I have tried several things but everything tried, so far, is promptly ignored and the default rounded image is displayed.

I like the basic layout except for the rounded images.

Hopefully this makes sense to you folks.  Great product, sorry for the nitpicks.