Assembly assembly = typeof(UnityEditor.EditorWindow).Assembly;
Type type = assembly.GetType("UnityEditor.GameView");
var gameView = UnityEditor.EditorWindow.GetWindow(type);
MethodInfo mi = type.GetMethod("SizeSelectionCallback");
Debug.Log(mi.ToString());
mi.Invoke(gameView, new object[2] {
3, null });
0是Free Asepect 3是Full HD (1920x1080)
Unity 2021.3.11f1c2