The Brazil POS has an option to associate the POS with a specific computer. This is so whenever you log into the POS, you will already be in the right register.
To enable this, navigate to POS Settings -> Associate POS. There you can add a checkmark in front of the register that you want to open automatically when logging into POS from that computer.
Now when you log into the POS, the register that will always open automatically in this computer.
Note: if clearing the cache, the POS the setting will make rollback to the default selection - No association (Select POS on login). This way the POS should be associated again if it is still necessary.