A HTML Dialog Field defines a Field in a HTMLDialogLayout. Whereas the layout (size and position) of the Dialog is defined in the Layout, the HTML Dialog Field defines the behavior.

You can configure the field including setting the Field type, the Initial value and mark it as Mandatory/Read only/Hidden.
On the Setting tab, it is possible to specify e.g. the content of a Choice Field Type, i.e. the options available in the dropdown choice list, see example below defining the options for a Risks Significance score.

Similary you insert the available template types in the Settings, for the SingleLink type, e.g. the relationship HasResponsible.
