Open Ended questions are the most common comment question format, but you can opt to enable comments for single option or multiple option questions, contact information questions, as well as matrix questions, just to name a few.
Comments for comment-enabled questions are public by default, meaning once a participant submits their comment response, it is visible on the public site.
You can elect to change this setting when you set up the question by clicking "Private" under the Comment Display options:
A few things to note about Comment Display and Privacy Settings:
You can update this setting once you've created the comment-enabled question as well.
To change this setting, click the question's gear icon.
Scroll down past advanced options:
and click Private.
As a project administrator, you'll still be able to see private comments on the project's Comments tab, but this will hide them from public view.
Note: If comments were set to Private initially, and you change this setting to Public, you won't be able to make any existing private comments public at any time after changing this setting. This is by design to ensure participants who wish to submit their comments privately can do so without fear of those comments being made public.