I was about to look into this the other day as well.As far as I can tell, there are two fixed-layout.page.xsl for preview and edit window (though I haven't yet confirmed this).The locations are: \local\config\lib\content_center\livesite_customer_src\web\WEB-INF\classes\com\interwoven\xsl\runtime\fixed-layout.page.xsl\local\config\lib\content_center\livesite_customer_src\preview\WEB-INF\classes\com\interwoven\xsl\runtime\fixed-layout.page.xsl As I said, I've not yet gotten around to working out exactly what the differences between them are, but we've been updating both files and both edit and preview work the same way.