Customizing the Windows host application

When you create a Windows app, Flutter generates a
small C++ application that hosts Flutter.
This “runner app” is responsible for creating and sizing a
traditional Win32 window, initializing the Flutter
engine and any native plugins,
and running the Windows message loop
(passing relevant messages on to Flutter for further processing).

You can, of course, make changes to this code to suit your needs,
including modifying the app name and icon,
and setting the window’s initial size and location.
The relevant code is in main.cpp,
where you will find code similar to the following:

Win32Window

::

Point

origin

10

10

);

Win32Window

::

Size

size

1280

720