Configure module widths

Hi there

Great extension!

I've used it to create a few templates already but today something's driving me insane. How do I specify the width of the different modules? I've done it before so I know I can define the percentages but now I'm clicking everywhere to find it but it doesn't appear. Where do I click for this layout screen to appear?

Thanks

Hi
if you talk about the aligned modules block, hover the main modules block and click on the layout icon.
CEd

Thank you!