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I'm not sure what you mean? Why would a side bar make the content jump around? Thats not how it works for me in Preview and other apps with sidebars - they stay whatever static size you set it to, just like a drawer but much more sleek.

Ah, now that I think about it, you must mean when you close the sidebar, the window stays the same size, so the content expands to fill it. I do agree that this could be annoying. Devs, is there a way to have the side bar "collapse" in a similar fashion to drawers? This wouldn't make me want to stick with drawers, however, 'cause drawers are teh ugly.