Hi Jared,
When we create a survey using the Survey123 web form designer it creates a folder and content in ArcGIS Online:
- The survey form item (used to load the questions)
- A Hosted Feature Layer (used to store the submitted responses; will remain private)
- Stakeholder and Fieldworker Hosted Feature Layer Views (provide limited access to the data for submitting or viewing survey data).

Survey123 leverages this content. It's important that we don't modify it - such as deleting, renaming, or as Keiren suggested changing the editing settings - as this could break the ability of the Survey123 platform to function. We can do some modifications with care. e.g. create new Hosted Feature Layer Views.
To share access to users we should do so through the Survey123 website:

Which then goes and updates the item sharing in ArcGIS Online:

You'll see the form and fieldworker views are shared publicly, giving access to the questions and ability to submit data.
Your content doesn't appear to match what I would expect to be created from the Survey123 web designer. Have we deleted or renamed content in this folder? Have we been sharing from ArcGIS Online? If so I'd recommend sharing access through the collaborate tab on the Survey123 website.
Here's a webinar I did talking more around this subject:
https://www.youtube.com/watch?v=dttJ8F-d5pA&feature=youtu.be
*Things may be a little different if we used Survey123 Connect, but general recommendations remain true.
Cheers, Chris