I change "map extent" to "area in map view" or "area on screen" in most apps. The public does not know what map "extent" means. Consider changing this phrase in Web App Builder. I'm sure you can figure out something phrased a little better! But a few ugly words that get the job done are better than a technical term no one understands. Users have not understood why things are missing in the Attribute Table in some apps and this is why.