A Fax Number is just a phone number so Xara is might be adding the tel: protocol automatically, but I've never seen this.
All you need do in the design is click on the number and a small po-up appears and you then click on the Remove option.
Or, select the number, open Web Properties > Link and pick Do nothing and OK.
https://helpandsupport.xara.com/xara...to-dialog.html
https://helpandsupport.xara.com/xara...ll-button.html
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