Rotate panes in current window
panes
// what it does
Ctrl+b Ctrl+o runs rotate-window, shifting every pane one position within the current layout while keeping the layout shape fixed. Pane contents move from slot to slot like a carousel. Useful for promoting a background pane into the main slot of a main-horizontal or main-vertical layout.
// shortcut
Ctrl + bCtrl + o
// gotcha
It moves pane contents through the existing layout slots rather than resizing anything, so in a tiled layout the visual jump can be disorienting. Alt+o (M-o) rotates in the opposite direction.