When a responder returns to a flow that they already started, you have control over where they will be placed within the flow.
To configure this, set Returning responder behavior in the Theme tab under Behavior.
By default, returning responders are placed at the furthest point in the flow that they had previously reached, with their existing answers present. This ensures that if the browser is reloaded, the flow will be at the same part of the flow, with the same answers.
With start at beginning, keep answers set, when responders return, their answers will be loaded into the flow, but they will be at the beginning of the flow.
This is useful if you would like responders to review submissions to their previous answers when returning.
With start at beginning, discard answers enabled, every time a responder returns to a flow, they will start with an empty set of answers. This new session will still be keyed using their existing responder UUID.
In kiosk mode, every time a responder returns to a flow, they are treated as a new responder. Answers are not loaded, and progress is not maintained, and, additionally, a new responder UUID is generated.
This is useful if you are using formsort in a physical store, or on a device that is passed directly to new users, where the particular browser that answers are collected on is not important in identifying users.