When there are more items than is set in Rows parameter for the widget, there might be buttons < > on a panel which pops up on mouse hover.
But it's really hard to spot that!

After a few weeks to use it, I feel it very inconvenient to scroll up, position mouse over a dynamically popping up header and click to navigate between pages. Especially when this widget is not very first on top of the dashboard.

Also, maybe would be good to show the same navigation panel bottom of the widget too! Because when there are other widgets below it, it's not clear - do I need to scroll back on top to possibly find that there are other pages or no.

So navigation in the widget is really not convenient if you have more items that set in Row option.