In the menu you can tick the option "Anonymous research" at "Survey" and "Anonymity". This option anonymizes the respondent's credentials. In the dataset this place will be marked "ANONYMOUS".
Note: When a survey is made anonymous, survey variables will not be displayed in the results file.
You can also anonymize data enrichment in "Anonymity" by excluding it from the result files. In this way you can anonymize created variables and uploaded data enrichment columns. If variables and data enrichment are anonymized, they can still be filtered in the results environment.