I'm a first time user of Xara Web Designer, so please be patient with me!

I've managed to design a fairly basic website in XWD 17 (and I've subsequently installed XWD18 to see if things are any different there). The site is largely aimed at people with visual handicaps, who'll be using full-size monitors or screen readers to view it, so I'm not really bothered about how it might display on mobile phones, etc.

I've designed the site with pages at a width of 1200px but I'd like it to automatically adjust to fit different monitors. The Xaratemplates website says, that from XWD 16 onwards, there's a Scale to Fit Width option available, accessible via Utilities > Web Export Options. However it doesn't seem to be present in either XWD 17 or XWD 18. Am I looking for what doesn't exist? (Perhaps it's only available in the 'Pro' versions of XWD?). Or am I just being thick? (Nothing new there!)

Any help is appreciated!

Chris