In an Experience I created, the Legend widget show symbol class field names which I would like to turn off. For example, if a layer called "LAYER" using unique value symbology on a field called "TYPE", the title "TYPE" will show up between "LAYER" and symbols. As you can imagine, the symbol class field names are usually abbreviated words, so I want to hide them in the legend, but I cannot do so.
I managed to publish the web map from ArcGIS Pro with symbol classes field names turned off in the legend. In old Map Viewer they are indeed hidden, but in new Map Viewer they still show up. I think Experience is built on new Map Viewer, so I am posting this idea in Map Viewer forum.