Install fspanel by entering the following commands in the terminal:
sudo apt update sudo apt install fspanel
Description:
minimalist panel for X
A panel for X that lists all your windows, while consuming minimal disk, memory, and screen space. It works under any GNOME compliant window manager (e.g. E, Sawfish, WindowMaker, IceWM, Oroborus) and supports KDE's mini icons (the KWM_WIN_ICON atom).
Homepage: http://directory.fsf.org/wiki/Fspanel
Version: 0.7-14
Section: universe/x11