Merge of #1615. Thanks @nicolaor

Author: bjansen

src/sdk/CHANGELOG.md

@@ -37,6 +37,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Pages - act on general existence of PageTitle-WebPart #1597 [czullu - Christian Zuellig]
 - The Url for Root-Site-API Request had // in path #1598 [czullu - Christian Zuellig]
 - Bumped version of Microsoft.Identity.Client package version to 4.68.0 #1611 [gautamdsheth - Gautam Sheth]
+- Page API: maintain full width header section in combination with vertical section #1615 [nicolaor - Rene Nicolao]
 
 ## [1.14]