New: Feed position. Choose Left, Center or Right in the popup (under Feed width) to move the feed to one side of the window. The left navigation and the right sidebar move to the other side: Left puts the feed first, then the navigation, then the sidebar; Right puts the navigation and sidebar first, then the feed. Center works as before and is the default.

• Works with the width rails, per-page widths and both "Hide sidebar" options.
• The page updates the moment you pick a side.
• Reddit's own behaviour is kept: the navigation still hides in narrower windows (below 1200px), and collapsing it leaves a slim strip beside the feed.
• Pages without a right sidebar (Explore, Settings) and post pages (back arrow) lay out cleanly.
• Below 960px the feed uses Reddit's normal single column.