Not sure I understand you, the UI scale is in options >interface. Should be set at 100% always changing it doesnt work. All it did for me was prevent me to scroll to the edges..
I find the F11 handy to remove all the inventory panels and to bring them just F11 again.
Seeing some images where the UI scale looks smaller it's not they are using a larger monitor so the UI scale looks smaller for the inventory panels pack mules.

Axe22, I'm not fluent enough in CEGUI to help, but you might try CEGUI forums. The one time I asked a question there the response was polite and reasonably prompt (couldn't do what I wanted, but that's not their fault).

Is this what you are looking for?
https://easybalancemodpack.wordpress.com/bigger-inventory-window/

Thanks, but no. That's not "hot". I already know about that technique. And it works fine. But all you are doing there is chaning the default settings used at load time. And the inventory panel obviously gets flowed correctly at thet point. It is when you change it after the game is running that it doesn't seem to wanna flow. The inventory items remain where they were before the window around them changed shape. That's the problem. Although it does clip them right.

What I am attempting to do is have several different layouts and a button that switches between them on the menu. I have everything working except this one bit. I am able to re-layout the rest of the window on-the-fly, but the damn inventory won't come with...