N/ui/serverWidget Module
Field.richTextWidth
Property Description: The width of a rich text field, in pixels. The minimum value is 250 pixels and the maximum value is 800 pixels. Rich Text Editing must be enabled.
Type: number
Supported Script Types: SuiteScript 2.0 Suitelet Script Type and SuiteScript 2.0 User Event Script Type (beforeLoad(scriptContext))
Module: N/ui/serverWidget Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Field.richTextWidth

// Code Example 1

//Add additional code

//...

var form = serverWidget.createForm({

    title : 'Simple Form'

});

var field = form.addField({

    id : 'custpage_textfield',

    type : serverWidget.FieldType.RICHTEXT,

    label : 'Rich Text'

});

field.richTextWidth = 100;

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4335332981.html