Install alttab by entering the following commands in the terminal:
sudo apt update sudo apt install alttab
Description:
task switcher for minimalistic WMs or standalone X session
alttab provides convenient visual interface and switching on releasing Alt, not on pressing Tab key. Being lightweight and depending only on basic X11 libs, it still features customizable look and behaviour.
Homepage: https://sagb.github.io/alttab
Version: 1.1.0-1
Section: universe/x11