Zentrox88
When you push end session on another user profile, the apps are not running anymore.
I assume you are referring to 'recent apps.' What you are seeing in recent apps is a saved thumbnail/screenshot of the app's last state.
To confirm this for yourself:
go to a user profile that was ended > view the recently opened apps > click on one that is at a submenu > the app takes time to load like your phone just turned on & the app is now at its main menu (not the submenu)