At present, there may be some issues with font thickness and font edge sometimes if you engrave text.
Before the issues are fixed with XCS, here is a solution below:
1. Download and install Inkscape: http://www.inkscape.org/ , which is a free, open-source, and powerful vector design software.
2. Design your text and style it in Inkscape.
3. After finishing the design, select the text and click the menu bar - path - object to path. With this step, you will convert the text object to a graphic.
4. Export it as an SVG file.
5. Import the file to XCS (xTool Creative Space).
6. Engrave it! The outcome will be awesome!