Form with default settings will not have inner scroll. You need to define “scroll” attribute.
By default form will adjust self to fit all inputs, and as result it may produce scroll on the external container ( document.body ), unfortunately webix styles block such scroll. To restore it you can add css style like next
<style type="text/css">
body.webix_full_screen{
overflow: scroll;
}
</style>
In such case you will be able to use a global document scroll.
P.S. The “scroll” attribute of form doesn’t work well. So while it must work, it doesn’t work for your sample. It will be fixed in the next build.