To change the value of a General or Accounting preference using SuiteScript 2.0, you must load each preference page using config.load(options) in N/runtime Module
where options.name is COMPANY_PREFERENCES or ACCOUNTING_PREFERENCES.
The config.load(options) method returns a record.Record.
You can use the Record.setValue(options) method to set the preference.
You can use the Record.getValue(options) method to get the preference.
Example
let configRecObj = config.load({
type: config.Type.COMPANY_PREFERENCES
});
fieldValue=configRecObj.getValue({fieldId:"fieldId"});