This is a useful article that explains sharing across variants: https://help.xara.com/article/154-li...cross-variants. Google "Xara Variants" and you will find some older videos that might be worth a look too.

Some important aspects to make managing variants must easer: use of text styles for each variant; you might have a Normal Text font size 18 (desktop), but 22 on a mobile; I always test on physical mobile devices Android and iOS as well as a 4K desktop. In all cases I use Scale-to-Fit-Width. I would keep in mind too that not all widgets respond well to variant sharing, particularly those that require different IDs for each variant - the WOW slider being an example.

Gary