If you have selected Online Survey as the consultation type you will be able to select Online Survey (option 2) on the consultation dashboard. Learn more about all of the types of consultations here.
You can choose whether the consultation follows a linear or a non-linear structure. You can learn more about the differences between them in this article.
When on the Online Survey settings page, scroll down to find the Progression format option to change the survey from linear to non-linear (or vice versa).
The box will automatically be checked, making linear the default option. Uncheck the box if you require a non-linear structure.