Arclab Web Forms Builder looks quite punchy in the technology it is using and also in its price (200USD or 299EUR or 194GBP).

It is telling that the only example form I found at https://www.arclab.com/en/contact.html was not responsive.
I could not find any examples of the embedded code other than this: https://www.arclab.com/en/webformbui...tion.html#host.
All of the form HTML is replete with IDs. Copying to a Xara Variant will therefore not work as the design file JavaScript will only ever find the first instance of an ID.

Find out if the code is responsive. The User Manual at https://www.arclab.com/en/webformbui...er-manual.html has a section https://www.arclab.com/en/webformbui...rm-styles.html.
If so, embed into a separate page and use Embed a Website Widget to set up IFRAMES to access the same form in Main and Variant; this probably means the form has to be quite narrow.

Your best solution might be to open the form directly: https://www.arclab.com/en/webformbui...host-page.html.

Acorn