tmux/Option/pane-border-indicators

• pane-border-indicators

  • Controls the visual markers used to identify the tmux/Pane/Active.

  • Values

    • off — show neither indicator.
    • colour — color half of the shared border when a window contains exactly two panes.
    • arrows — draw arrows pointing toward the active pane.
    • both — use the color and arrow indicators together.