1. 默认显示效果

2. 修改后效果

3. 修改方法

main.cpp中添加QApplication::setAttribute(Qt::AA_DisableWindowContextHelpButton);

int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endifQApplication::setAttribute(Qt::AA_DisableWindowContextHelpButton);  //添加这一行QApplication app(argc, argv);//...//...//...//...
}