Are you working in Photo and Graphic Designer? Your profile still shows Webstyle.

Create your image that you want to use for your favicon. Apply the name. And move it off the page onto the pasteboard.

When you publish your site, Xara also creates a 16 x 16 pixel favicon.ico graphic which I think it places in the root directory of your website.

The web browser, if it finds a favicon.ico file automatically displays the image in the browser tab (as with the TG logo here) and also next to your site if someone bookmarks the site.

All you have to do is create your graphic, name it, and forget it.