Just as you can control which views are open and active, you can also control the layers within your Active View. Within the step, you can control a layer's visibility, whether it is selectable or not, editable or not, snappable or not, whether it is a selected layer, and the label visibility.
The following screenshot shows you the Contents tab in the Task Designer pane:
The level of layer control is very powerful. It ensures that your data is protected and only works with the layers you need to in any given step. For example, if you are editing a parcel within a step, you would want to make sure the Parcel layer is set as the only editable layer. This will ensure the user doesn't accidentally edit the City Limits or Buildings layers by accident, as an example.
Now that you have a much greater understanding of how steps are configured and work within a task, you are now ready to begin adding steps to the...