Unfortunately, the privacy policy is not shown when "All in one" format is selected.
Once the format is changed, the privacy policy is displayed.

firstpage.twig contains:

{# If survey mode is "All in One", this will add the welcome/privacy messages (if activated) #}
{{ include('./subviews/messages/welcome.twig') }}
{{ include('./subviews/privacy/privacy.twig') }}

There is a div privacy in the html code, but no content.