title: Qt - How to control the widget sizes in QLayout
body: <p>I am trying to put some spinboxes,line edits in a layout. But the size extends more than the neccesity. Below is the figure
  <img src="https://i.stack.imgur.com/dP11u.jpg" alt="alt text"></p>
  
  <p>Here I am adding a QScrollArea widget,and a QVBoxLayout into a QHBoxLayout. Then I am adding the line edits,spin boxes into the QVBoxLayout. But I want to reduce the width as 2/10 of the total width. Can anybody help me in this? </p>