Supporting Windows UI guidelines

While you can use any visual style or theme you choose,
including Material, some app authors might wish to build
an app that matches the conventions of Microsoft’s
Fluent design system. The fluent_ui package,
a Flutter Favorite, provides support for visuals
and common controls that are commonly found in
modern Windows apps, including navigation views,
content dialogs, flyouts, date
pickers, and tree view widgets.

In addition, Microsoft offers fluentui_system_icons,
a package that provides easy access to thousands of
Fluent icons for use in your Flutter app.

Lastly, the bitsdojo_window package provides support
for “owner draw” title bars, allowing you to replace
the standard Windows title bar with a custom one
that matches the rest of your app.

Customizing the Windows host application