HELLO! @astagnaro.land
Welcome to the LastPass Community.
We truly apologize for the problem, by default the LastPass browser extension is set to keep the session active 2 weeks, but you can change the extension settings by following the steps below:
Open your browser extension
Click on Account, Bottom right corner.
Go to extension settings.
Find the option "Log out when all browsers are closed" this is in the "General" tab.
Once done by the time you close the browser the session will expire automatically.
Please let me know if you need additional help.
Greetings!
Verlaine | Customer Care