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The Save Button Label can be customized for each step in your workflow. For example, you can change the button text to Save for Later on step 1 of your flow and then to something different on step 2. This will help users understand what to do if they want to save a partially completed flow. Simply click on a step in your flow, click the Edit Flow Properties icon from a flow step or a section of the Properties Navigator on the left side of the Flow Designer and enter the text for the Save button label in the Save Label property.
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