If you use the Google Chrome browser it has an option to "Continue running background apps when Google Chrome is not running." For security reasons you should disable this feature. If you're logged in to MyHealth Records and forget to sign out, someone else may be able to get into your MyHealth Records account if they start using the same computer.
To disable this feature:
1) Click on the Google Chrome menu (3 lines in the upper right of your Chrome browser).
2) Click "Settings".
3) Scroll to the bottom and click "Show Advanced Settings."
4) Scroll down to the heading "System" and make sure the option "Continue running background apps when Google Chrome is closed" isn't checked.
Always sign out of your MyHealth Records account when you're finished, before closing your browser.