Question:

Despite adding blank spaces to the EM page layouts, none display Online. Why are blank spaces ignored for EM Page Layouts in CRM Online?

Answer:

Blank Spaces that are added to standard Salesforce page layouts are not supported for pages using the EM Page Layout Engine. Blank Spaces are ignored and do not display on the EM page layouts.

Customers can submit an Enhancement Request.  

Related Documentation:

CRM Knowledge Article: How to Submit a Product Enhancement Request for Veeva Products?