When editing the ‘Category – Single answer’ and ‘Category - Multiple answers’ question types, the option ‘Hide radio buttons’ or ‘Hide checkbox buttons’ is available in the ‘Advanced’ tab of question settings that open when you click on the question.
This functionality is particularly useful for adjusting the survey for mobile devices, especially in the case of image based-answers. In this case, you can hide the buttons (radio or checkbox) and respondents who will complete the questionnaire via mobile phone will choose the answer or image by tapping on the answer or image instead of the radio/checkbox button.
Example of a survey with hidden radio & checkbox buttons-mobile preview >>
Example of a survey with hidden radio & checkbox buttons-PC preview >>