User to see only data related to his company

1

In a group of companies, how do I make a user see only things concerning his company?

I want when a user, an Employee of Company (A) logs in, he should only see information related to Company (A) while user for Company (B) sees information related to Company (B)

2

This case may help Problem with Multi-Company User Permission

3

Check user permissions:

https://docs.erpnext.com/docs/user/manual/en/setting-up/users-and-permissions/user-permissions