Not sure if this has been mentioned before, but I would really like to be able to use the same function that I am able to use in ArcGIS Layout View, where I can check to only display items in the TOC that are checked, or to only show items that are in the map extent. Right now in a web map, even after I filter, all of the items still show in the TOC and legend. I can somewhat bypass this by dragging all of the icons I don't want to show up in the legend of a web map/app under the Other option in the Change Style (Unique symbols) menu, but with over 30 items, this process is cumbersome.
For example, see pic. If I only want to show Campground Camping, I will have to move all of the other legends under Other so that they don't show. Is there a better workaround than what I am using? Or can this be added as new functionality?