bool Window::IsVSync() const
{
    return static_cast<bool>(m_WindowData.VSync);
}

enum class VSync : bool
{
    Disable = false,
    Enable = true
}

VSync Window::IsVSync() const
{
    return m_WindowData.VSync;
}

binary '<<': no operator found which takes a right-hand operand of type 'VSync' (or there is no acceptable conversion)

std::cout << myWindow.IsVSync() << "n";