Welcome to the form, Tanlady. Xara3D by default scales everything to fit the width of the screen. If you look at the Font size box in the toolbar, it will usually say Fit to width. If you click on the dropdown arrow next to it, you can select a specific font size in Points (pt). The maximum you can enter is 288pt.

Also, by selecting a particular character or word, you can change its size with the same box, which will now show a % figure. So to make your selection half-size, set it to 50%. The lowest you can set it is 5%, the highest is 400%.

I hope this helps,

Mike