You can also activate the flow from its tile toolbar.
If the data flow was already active, it is marked as 'changed since last activation'. ION Service is not changed until activating the changed data flow. When reactivating a data flow, the used connection points and mappings are also activated. If the connection points are used in another active data flow, the changes are also deployed in that data flow. For mappings the changes are applied to the data flow that is reactivated.