Right-click the Add-in Definition node and select Form Definition to add a Form Definition subnode () where you can define a form that will be part of the add-in, typically as its main settings window. A Form Definition appears for the add-in in the Add-In Libraries window and on the Add-ins menu in the Developer toolbar. Other form objects used in the add-in do not need to be included using a form definition.

In the Label field, type a suitable label for the add-in form.

Select which form to use as a Form Definition for the add-in from the Form list.

From the Show as list, you can select whether the form should be displayed as a Settings form (the default) in the model tree or as a Dialog box.

Select the Allow multiple settings forms check box to allow for more than one instance of the settings form in the model tree.

The Form Definition node’s Settings window contains the following section:

Here you can write a descriptive text for the form in the Description field. The Description appears in the Add-in Library window and as a tooltip when choosing among add-ins from the Add-ins menu in the Developer toolbar.