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

You can set a custom icon size in gtk-icon-sizes with the name panel-tasklist-menu. The default icon size is 16px.

~/.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.
* { -XfceTasklist-max-button-length: 200; }
 
# Ellipsizing used in the task list and overflow menu labels.
* { -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).
* { -XfceTasklist-minimized-icon-lucency: 50; }
 
# Maximum number of characters in the menu label before it will
# be ellipsized.
* { -XfceTasklist-menu-max-width-chars: 24; }

See the theming section for more information.

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