When non-empty, this option enables the window bar and determines its contents. The window bar is a bar that's shown at the top of every window with it enabled. The value of 'winbar' is evaluated like with 'statusline'.

When changing something that is used in 'winbar' that does not trigger it to be updated, use :redrawstatus.

Floating windows do not use the global value of 'winbar'. The window-local value of 'winbar' must be set for a floating window to have a window bar.

This option cannot be set in a modeline when 'modelineexpr' is off.

(default empty)