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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