Hello! @User17739005494378567936
Welcome to the LastPass Community, if you don't want for LastPass to automatically logoff, please make sure you are login to LastPass through the browser extension and make sure logoff settings for the extension are disabled, if you require additional assistance, please use the Customer Support contact form here to request additional assistance.
I'm sorry this security feature cannot be turned off permanently. However, you may utilize "trusted device" options on most computers and mobile devices, utilizing biometrics integrations to easily "unlock" the logged in LastPass app for a more seamless experience.
** Logging in regularly with the account password is crucial for the recovery password system, which get created each time you log in successfully, and are cleared anytime the local cache is wiped clean.