HI All,
I need to apply custom master page on _layouts pages for Share Point 2013 Online web application. In on premise environment we have option in central administration to set “Application _layouts pages references site master pages” under “General Settings” specific to any web application to achieve this (as shown below). But I don’t see the same option available in Share Point 2013 Online anywhere.Is there any way to access general setting of SharePoint 2013 web application ?