Hi David,
Scrollbars are handled by GDC. They are automatically displayed since GDC 2.21, therefore you'll find a mention in the GDC documentation concerning 2.21 new features:
https://4js.com/online_documentation/fjs-gdc-2.30.01-manual-html/User/NewFeatures221.html#221AutomaticScrolls'formScroll' is a style attribute which has never been documented for the main reason that we cannot certify it's going to work in all situations. This is something really not simple to handle.
"formScroll" is nevertheless still implemented, and thus <StyleAttribute name="formScroll" value="no" /> should remove the mechanism of automatic scrollbars in most of cases. At least, it has worked in the sample I tested using GDC 2.30.05 and 2.22.06.
Regards,
Lionel