klowetx, in a nutshell, Xara renders HTML code that does not care about caching. That task is down to how & where you are serving your pages.
Before HTML5 you could add a caching <meta> Tag into your website head. You could try: <meta http-equiv="Cache-control" content="public">, but with no guarantees. It may fool Edge but might be doing nothing.
What is far better is to add a .htaccess file into the root folder of your website. Xara cannot do this for you although it does allow you to 'Explore web space' through its Publish > Settings.
Normally, you would access the root folder through some FTP client.
Another approach is to hook into a free Cloudflare service, https://www.cloudflare.com/en-gb/abo...tion/?pr=asas1, where the cache-control is covered by Cloudflare's CDN servers instead.
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