Hi!
They way how to configure the status bar did not really change between Felgo 3/Qt 5 and Felgo 4/Qt 6.
You can try to adapt and use the project in Qt 6 as well. If you only want to choose a light or dark status bar, you can also directly configure the Felgo Theme.colors.statusBarStyle: https://felgo.com/doc/felgo-themecolors/#statusBarStyle-prop
When using a custom status bar solution, configure the Felgo style to statusBarStyleCustom. This ensures that after the initial configuration, Felgo does not overwrite any status bar changes that you make with custom code.
The important part of the project you linked are the native Android/iOS methods that configure the status bar as needed. You can add similar code to your Felgo 4 / Qt 6 project. Another option is to use QML Native Code to make the relevant calls from QML (https://felgo.com/doc/felgo-native-code-components/).
Best,
Günther