Re:amaze gives you ability to update the Favicon displayed in the browser tab of your Help Site FAQ to match your current preference.
To update your Favicon, navigate to Settings > Brands. Then click "See all settings" for the brand you would like to update. Scroll down a click on "Custom CSS and Meta Headers."
In the "Meta" field, provide the following: <link rel="shortcut icon" href="[https://example.com/favicon.ico"> and make sure the link points to the URL of where your favicon lives. Once you're done, click "Update."