...
When configuring the task you need to create an empty Flow and add the Align Polygons task to the Flow’s plan space (see Working with Flows and Tasks Setting up a Flow and Adding Task to Flow at the bottom of this page for general information on creating Flows and managing Tasks). Assuming that you have all required layers available in your map, setting up the Align Polygons task is a very simple task. You need to provide each parameter by selecting a layer name or a field name from the drop down lists.
...