title: PyQtGraph : how to change size (height and width) of graph in a ScrollArea
body: <p>I'm trying to plot graph in a scroll area but I've no idea how to change the size of my graphs. Here is an example of what I have: </p>
  
  <p><img src="https://i.stack.imgur.com/GkaCb.jpg" alt="enter image description here"></p>
  
  <p>As you can see, in my ScrollArea (in Red) which as the size I want, I have a graph (well, in reallity I have more graphs and I want to see more then one (at least two) in this area).</p>
  
  <p>So, I want the height of my graph (A) to be smaller and the width of my graph (B) to be expanding. Somine can help me ? </p>
  
  <p>Thanks for your help !</p>