How to share apps between multi-user ?

Maybe read my answer again, not sure what part of me asking for details made you think I know or not about this

my bad ! and my apologies for trying to be a smartass…

(aka install separately, it’s the same APK; can’t configure for all at once, you need to do it for each user)

that, I understood, since each user has its own environment. Because of these separate environments, I guessed , apparently wrongfully, that each installation required to save apks in each separate environment.

What would be required to automate the installation for each existing user ? Could there be a shell command to achieve this ?