How to set up the visibility of certain records for each individual?

You can configure the access rights for each group in each sheet, the visibility of the record will depend on which level of access rights the users' group has. If the user has Survey User access rights, he or she can only access to the records he created or assigned to him. On the other hand, if the user has Bulletin User access rights, he or she can view all records, but can only edit the records he or she created or is assigned to.

If you need more detailed examples of access rights settings, please refer to this page.