The Window Buttons panel plugin allows allows you to switch between application windows using buttons.

~/.config/gtk-3.0/gtk.css

/* The maximum length of a button before the label ellipsizes.
   When this value is set to -1 the button will expand to the
   entire available space. */
.tasklist {
  -XfceTasklist-max-button-length: 200;
}
 
/* The minimum length of a button, even if the label is smaller. */
.tasklist {
  -XfceTasklist-min-button-length: 50;
}
 
/* The maximum size controls the number of lines on which
   buttons rearrange themselves: panel-size / max-button-size.
   So the button size can actually be up to 2 * max-button-size.
   When this value is set to -1 there is no maximum size. */
.tasklist { 
  -XfceTasklist-max-button-size: 32;
}
 
/* Ellipsizing used in the task list and overflow menu labels. */
.tasklist {
  -XfceTasklist-ellipsize-mode: PANGO_ELLIPSIZE_END;
}
 
/* Lucency of minimized icons. Valid values are between 0 (completely
  hide the icon) and 100 (don't lighten the icon). */
.tasklist { 
  -XfceTasklist-minimized-icon-lucency: 50;
}
 
/* Maximum number of characters in the menu label before it will
   be ellipsized. When this value is set to -1, the width will be
   calculated automatically. */
.tasklist {
  -XfceTasklist-menu-max-width-chars: 24;
}

See the theming section for more information.

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