title: Why QT Creator Preview so different from what I actually get?
body: <p>New to QT, started about a month ago.</p>
  
  <p>I was told that I can use setStyle() to modify the style, but windows only accept fusion and windows. </p>
  
  <p>How can i get ui like preview?</p>
  
  <p>Using qt5.11 , c++. Project run on windows.
  If u know about these, please tell me, thanks.</p>
  
  <p>This is preview</p>
  
  <p><img src="https://i.stack.imgur.com/2IHyL.png" alt=""></p>
  
  <p>This is what I get</p>
  
  <p><img src="https://i.stack.imgur.com/kd1yI.png" alt=""></p>