A small multiple (also known as a trellis, lattice, panel or grid) is a series of charts using the same scale and axes, allowing them to be easily compared. This visual allows you to take a measure you might normally plot in a line chart, and duplicate this for the values of another category.
Refer to the example .pbix file, or the documentation for more details.
Version 18.104.22.168 (28 Aug 2020):
Version 22.214.171.124 (15 Apr 2020):
Version 126.96.36.199 (15 Jan 2020):
A full write-up of changes can be viewed at http://bit.ly/smlc-2-changes
Version 188.8.131.52 (29 Nov 2018):