When setting sheet Access Rights, first define the Sheet Level Access Rights to determine whether a user group can modify or create records on the sheet.
If users have access to the sheet but you don’t want them to access certain fields, you can set Field Level Access Rights to further restrict access.
For example, to make a sheet accessible to users who are not logged into the database (including guest users), you can set the Sheet Level Access Rights for the EVERYONE group to Bulletin User, allowing the public to fill out the sheet and provide feedback. However, if certain fields are meant only for reference and should not be modified by users not logged in, you can set the Field Level Access Rights for the EVERYONE group to "Viewer" for those fields. If there are fields you don't want them to see, you can set the field Access Rights to "No Rights".