In tmux, the status bar normally shows the current working directory of a pane in the window list. If I have for example two panes in a window, and the two panes have differ
In addition to the previous answer, I'd like to add you don't have to rely on the status-interval option. Waiting to see the change isn't really elegant. You can manually update the status bar on events with:
tmux refresh-client -S
I use this option after pane/window/session switching. In my tmux config you will find for instance to switch panes:
bind -r k select-pane -U\; refresh-client -S
bind -r j select-pane -D\; refresh-client -S
bind -r l select-pane -R\; refresh-client -S
bind -r h select-pane -L\; refresh-client -S
I have previously posted on this: manually refresh status bar