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You may notice a difference in behavior when using a flow on the desktop vs on a phone/tablet. For Example: Imagine a two activity flow where 1st activity has 2 pagebreak controls and neither activity has an assigned role/user. On the phone/tablet this translates into a screen flow with 3 steps for 1st activity and 1 step for 2nd activity. You can use the Previous button to get back to the 1st activity from the 2nd activity.
However, on the desktop there is no "Previous" button so once the flow gets to 2nd activity there is no way to get back to 1st activity. If the designer does not configure the Navigation Tool Bar in this situation once the user gets to the second step in the flow, there is no way to return to the first activity when running the flow on a desktop.
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