>hello how are you, I need your help, I am trying to make a multi-company system but based on different data, how can I do it from a screen with all the companies the selected application is executed and after leaving that application I will return to the screen of the companies and to be able to execute any of the companies with only to put user and password only once

I think you do not have to leave the application

(1) launch screen to select the company
(2) Store the company somewhere ( = company context) and exit that screen
(3) Add the application's menu - including an item to close the company
(4) work with company data
(5) if the close company is selected from the menu ( and it should be disabled ( = skip for) as long as there is a screen active
- clear the company context
- remove the application menu
- go to (1)