In case you are not aware, Fluent UI icons is set of open source icons designed by MS which are already being used on MS mobile apps (Office apps, Outlook, MS Edge mobile app, MS Launcher & etc.)

https://github.com/microsoft/fluentui-system-icons

This app uses the built-in Segoe MDL2 Assets glyphs for iconography which is fine and looks consistent with the current ecosystem of Windows.

All WinUI/UWP apps currently use the MDL2 icons but there are some user request to provide an option to switch to Fluent UI icons

microsoft/microsoft-ui-xaml#2439

Uno platform already provides a way to use Fluent UI icons (they have 1:1 replacement font file for Segoe MDL2 Assets font)

https://github.com/unoplatform/uno.fonts

Files UWP already made the switch to Fluent UI icons.

Why not you?

Even if not enabled by default, please provide an option to swap the fonts. Have a nice day!