I've made the change to the App.config file to set to use the 'Fluent' Theme for all forms everywhere in the application:
<add key="TelerikWinFormsThemeName" value="Fluent" />
..which looks perfect in the Designer, but the runtime is still using some other theme.
The form does not specify a Theme, so I thought it would use the 'Fluent' theme which I specified.
Do I need to do something else to make the runtime form use the right theme? I'm confused....