Where are the large widgets located?
I'm not sure I understand your question...
Long press on the screen on any page, then tap Widgets - some apps have multiple sizes of widgets, some have larger or smaller widgets - choose the widget configuration that works best for you on the screens you typically use most.
Is there a particular "large" widget you are looking for?
I like when you can Group Apps together like Games or Like Google on the home Screen not sure if the S6 can do this my One M8 and my Maxx can
