Install cairo-dock-folders-plug-in by entering the following commands in the terminal:
sudo apt update sudo apt install cairo-dock-folders-plug-in
Description:
Folders plug-in Cairo-dock
A collection of official plug-ins and applets for cairo-dock. . This plug-in provides that applet imports folders inside the Dock. User can have as many instances of this applet as user want, each one with a different folder.
Homepage: http://www.glx-dock.org/
Version: 3.4.1-2build1
Section: universe/x11