[WORKAROUND ALERT IN X502]
For .chm output, you could:
1. In the Topics pane, select all the topics (click on one
topic and press Ctrl+A).
2. Right click in the highlighted area and select Properties.
3. In the Appearance tab, select the different style sheet.
4. Click Save.
5. Generate the .chm file.
6. (optional) Repeat steps 1-4 to revert to previous style
sheet setting.
Good luck,
Leon