How to set same region on different pages with different weight?

In the theme settings under Content Zone -> Configuration, check the "Customize the region positioning". Then change the position number for each region according to the order that you want them in. In your case it would be Content = 1, Sidebar First = 2, Sidebar Second = 3

You have two options: Either change the "WEIGHT" of a region (=Positioning in the HTML Sourcecode) or you can check the "Customize region positioning" and change the "POSITION" of a region (=Positioning based on push/pull grid CSS classes).

The first thing (WEIGHT) declares the actual positioning in the HTML Sourcecode and the Position declares the visual positioning (This is important for Content First Concepts + Screenreaders).

May I ask a related question as I'm a little confused with the workings of the 'primary region' with regard to the visibility of sidebars (or any other region will nil content)

My understanding is that, if there is no content in the sidebars, then the contents of the content region would expand to fill the sidebars. Or that is my recollection from Omega version 2. I understand that the UI for static and dynamic regions has been changed in version 3, but I'm having difficulty getting it to work.

Currently I have the 'primary region' set as 'content', however the sidebars are rendering even though they do not contain anything.

I have some pages which have blocks in the sidebars and others which do not. Usually I would just specify or exclude the pages in the block configurations. Please tell me that I do not have to use delta and context for such situations.

Am I missing something obvious?

Disable debugging mode. In debugging mode Omega renders all regions, no matter if they have blocks or not. Also make sure the sidebars don't have "Force render" activated.

fuhby to the rescue... again!

Thank you