You can mark items of a certain category using the legend in a visualization.
The legend displays settings made on various axes. An example of an axis is the
axis, where each specified color represents a certain category. By clicking a category on an axis, you mark all items within that category.
For example, in the scatter plot below, the
axis is used to mark all items in the "group d" category, that is, all yellow items. The other categories, "group a-c" and "group e", are grayed out in the legend to indicate that only the "group d" is marked.
The legend cannot be used to mark items on axes with numerical data. Only categorical data on the following axes can be marked: the color, shape and series axes.