On each widget you can change the date, name, metrics and which platforms you show in the widget. See here how it's done.
You can also choose to duplicate a widget. This is useful if you want to explore similar settings - e.g. platform and breakdown, but want to see another metric. In this example below link clicks vs. CPC broken down to industry.
β
It could also be for comparing the same settings over 2 different time periods.