You can set a custom session timeout so your account gets logged off after a period of inactivity. This page explains how to adjust this setting for Free and Pro plan accounts.
From this modal, select the desired session timeout period from the dropdown menu and then click confirm. You will now be logged out each time you are inactive for the selected amount of time.
Note: If you are on an Enterprise Plan, only the organization Owner or Admin can change this setting. This setting applies to all users in the organization.