Use separator in tmux

.tmux.conf

@@ -28,6 +28,7 @@ set-option -g status-bg black
 set-option -g status-fg white
 set-option -g pane-active-border-style fg=grey
 set-option -g pane-border-style fg=grey
+set-option -g window-status-separator "#[fg=grey]  "
 
 # Left components
 set-option -g status-left-length 20
@@ -43,5 +44,5 @@ set-option -g status-right "#[fg=grey] %Y-%m-%d %H:%M "
 # %Y-%m-%d %H:%M "
 
 # Window list style
-set-window-option -g window-status-format "#[fg=grey]#I: #W "
-set-window-option -g window-status-current-format "#[fg=blue]#I: #W #[fg=grey]"
+set-window-option -g window-status-format "#[fg=grey]#I: #W"
+set-window-option -g window-status-current-format "#[fg=blue]#I: #W"