The payment split shows you the split of your different payment options with your selected filter applied. You may click on a slice here to add it as a filter.
Payment method category
The start view shows your payment split with a categorized base. If you have multiple card or invoice options, these will be grouped together into one slice.
Payment method option
You can click on the dropdown inside the widget to change the contents to the specific payment methods that you use. In this view, multiple different invoice types will be shown separately instead of grouped together.