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To add a field to a section just drag and drop it from the sidebar on the right into the section.
You can also drag and drop fields from one section to another.
Or remove a field from a section by dragging and droping it into the sidebar on the right.
If you press Configure on a field or the Cog icon,
a dialog opens and you can, for example, change the description or specify that the field is required.
Don’t forget to save your changes by clicking on the Save button.