Moving Component Presentations on a legacy Page into Regions
If your organization has opted to migrate from legacy Pages to Region-based Pages, you may open a legacy Page to find that it now has a Region hierarchy, while all of its Component Presentations are on the Page level (the root Region). This means that you can (and sometimes must) move the Component Presentations into the Page Regions.
About this task
Before moving Component Presentations into Regions, first talk to your implementer to find out which Component Presentations are supposed to go in which Regions. Each Region may impose its own restrictions on which, and how many, Component Presentations it can contain.