The fields labeled with an underlined word may be expanded. They expand at the expense of the other such fields, which disappear. To expand a field one clicks on its label or <alt>-clicks within the field itself.
In the browser depicted in this image, the forms field has been expanded at the expense of the definition and comment fields.
We have made the forms, definition, and comments fields expandable because they are likely to contain more information than the other fields. It is often convenient to make these fields as large as possible.