Creating a form
Simply right-click on any process step, and select Form Designer
Rename your form
Top Aligned Field Labels
Left Aligned Field Labels
You can change the position to which your labels will be aligned, for any new fields you are dropping onto your form, by switching the position mode:
You can switch the label position for fields that are already on your form
Advanced form layouts
You can create multi-column form layouts
Using your form
Remove forms from Steps
You can delete a form, which effectively means no form will be associated with the step in question any longer.
Go to the step in question, right click, go to Form Designer, then use the top-right menu to select Delete Form.