There is a app in Felgo Apps Mobile edition. At the bottom there is a Login UI Example and also There is a Settings UI Example. I am not referring the first one that is Component Showcase. And I cannot find it in <Path to your Felgo SDK>/Examples/Felgo/appdemos/ or anywhere else. 🙁
You are right, these short examples are not shipped as demo projects with Felgo Engine. However, they are available in Qt Creator with the project wizard.
Create New Project -> Felgo Apps Project -> Master Detail Application (settings) or Login Application (login example).
The QML files can also be found in the <Path to your Felgo SDK>/Examples/Felgo/appexamples/templates folder.