Final answer:
Visual cues in data visualization, such as sorted bar graphs and pie charts, enhance the readability of a chart by indicating sorting order through the size of elements or symbols.
Step-by-step explanation:
The visual indicators of whether a chart or data view has been sorted can vary depending on the type of visualization or software being used. According to the information provided, a Pareto chart, which is a type of bar graph, is sorted from largest to smallest to facilitate easier interpretation. This sorted chart is more visually informative compared to an unsorted one, as it highlights the most significant factors first. Pie charts are also mentioned, where the size of each wedge can be organized to enhance understanding. Although this question does not explicitly mention how a user can determine if sorting has occurred, it is common for software to indicate sorting through visual cues such as highlighting, symbols, or the arrangement of data.