Screen Layout Switcher missing
It has two Neon installations. The first installation is the upgrade Neon + Xenial to Neon + Bionic, the other installations are the installation with Neon + Bionic. Screen Layout Switcher is missing in both installations when I start neon
I do not know how this module is called and how do I install it manually

Do you mean this:

start
system settings
desktop behaviour
virtual desktops

Oh my God. No, no, no
This
https://i.postimg.cc/KY3bx7qh/014.png

I am pretty sure the screen config OSD does not trigger every boot. You'd have to plug in a new screen or hit the screen config button (e.g. on laptops).

This program starts on desktop at Kali every time. Neon once appeared and never again. I have 2 screens connected and I plug in a third time periodically. It would be nice if I knew all about this program or what it's called and how it is reinstated.
Thanks for the reply