As I am coming from XAML, I wonder if it is possible to make multipage, fluent and modern UI in C++ easily. Not necessarily easily, but it shouldn't be as creating an OS.

I heard about Qt, I loved it, but it is a little complicated.
is there is any suggestions?

Do you believe that Qt is more complicated than Windows Presentation Foundation?

Good question. I don't think so.

@Demolishun the .UI file and the .QML files

was complicated for me.

it is not like XAML. for example, to create a simple button

<Button x:Name = "mybutton"

Content = "Hello"

Click = "OnClick"

Margin = "10"

Width = "150"

HorizontalAlignment = "Center"

Foreground = "Gray"/>