Install afterstep by entering the following commands in the terminal:
sudo apt update sudo apt install afterstep
window manager with the NEXTSTEP look and feel
AfterStep is a window manager based on FVWM which attempts to emulate the NEXTSTEP look and feel, while retaining the configurability of its predecessor. Note that this window manager makes extensive use of the color palette. If you have only an 8-bit color display, it will run as packaged, but you may want to modify the configuration to use fewer colors. . AfterStep is a continuation of the BowMan window manager project, but the name was changed to reflect the desire that it do more than simply emulate and become a valuable window manager in its own right.