How to build an addon settings panel?

[Zax]

I'm totally lost in the new way to display the settings of an addon.
I looked at the Vertical Layout example found at https://wowpedia.fandom.com/wiki/Pat....0/API_changes.
Sample code works and it is correclty displayed in my addon setttings panel but I would like to add some simple frames with texts (fontStrings), or simple buttons, to this panel.

Thank you for any help.