On the Dashboard tab Vendor there are two charts, one with the largest vendors based on the number of invoices and one with the largest vendors based on the sum.

Start by choosing the period you want to see in the top of the tab, the dates are invoice dates.

It is possible to filter vendors based on parts of the name using wildcards such as * and %.

Then click on one of the pieces in the chart and a list of the vendor's invoices is displayed.