Please see attached image - the symbols of the toolbar items are not displayed properly.

Note this only happens in a WinUI unpackaged app - <WindowsPackageType>None</WindowsPackageType>.

 

This seems to be an MS issue, which is logged here (https://github.com/dotnet/maui/issues/19608).

 

One possible work-around is to manually set the ImageSource property for each item in the toolbar. Then for example images can be used in the source, or glyphs from some built-in font may be used (like Arial, Calibri, Segoe UI).