We created an Epicor product configurator and deployed it to EWA for customers to use on our ECC website. The width of the iFrame window limited to ~600px and displays a horizontal scroll bar if the width of the configurator window is wider than that. We couldn’t information in Epicor documentation to increase the iFrame width. If you run into the same issue, you can increase the max width of the iFrame window by adding a css script in Magento. Below is a sample script. Change the max width as needed.
In the Magento admin panel, go to Admin > Content > Configuration > Click Edit against Store View > HTML Head > Scripts and Style Sheets
<style>.modal-popup._inner-scroll.configuratorpopup .modal-inner-wrap {
max-width: 700px;
}
</style>
