Rendering-screen aspect ratio

After changing hard drives, totally moving my content, etc etc I finally have everything working quite nicely.
Question: previously when setting up a render the screen size (i.e. what I see when beginning a render) would change when I changed the aspect ratio of the render. Now . . . the final render does reflect changes I make to the screen aspect ratio, but I don't see the changes in DAZ before starting the render for some reason. I.e. the screen doesn't look like the final render in terms of aspect ratio. Is there a setting to change this? I can't seem to find it.


forum_Q.jpg
581 x 569 - 125K
Comments
On the options menu for the viewport (rectangle with horizontal lines) tick "Show Aspect Frame".
Exactly! That's much better, thanks.