If the answer isn't mandatory and the user decides to skip it, the answer will appear blank in this section as can be seen in the image.
This will allow you to track your users in a specific way, analyzing each one case by case to see what they responded and understand the reasons why some users evaluated positively and others negatively your brand, product or service, instead of grouping all the answers together.
You can also choose the period for which you want the information to be filtered by, making the analysis more personalized.