If your chart has multiple data columns or sheets (there are tabs displayed above the chart), you can adjust settings for each sheet separately. To do that:
❶ Select your chart (one click) and locate the drop-down "Settings: Global" at the top of the right sidebar
❷ Select one of the sheets.
Now you can customize colors, axis labels, axis ranges, used icons and number format for each individual dataset - for example, have different colors, different icons used across your pictorial chart or different axis labels appearing when toggling between tabs in your chart. Note that enabling chart settings by dataset will turn off global settings and vice-versa. To return to previous state, click the link at the bottom of the right sidebar when in individual sheet mode: