The new Map Viewer in ArcGIS Online and ArcGIS Enterprise is the next generation map-making tool that provides new ways to visualize data and build compelling web maps. We have expanded and improved smart mapping in Map Viewer to help you explore your data, try out drawing styles that showcase important patterns in your data, and create useful, attractive maps like never before.
Get (Re)Acquainted with Smart Mapping in Map Viewer (esri.com)