Use
You can add a legend and define the position in the chart where it should be displayed. In a portfolio chart you can also decide if the legend should show two reference bubbles. These are used for comparison purposes to be able to better estimate the size of the bubbles displayed in the chart.
You can delete a legend that you do not need.
Procedure
Adding Legends
This brings you to the dialog box with the same name.
In this case you can click on the legend symbol in the chart to display the legend. If you click on the legend again, it is displayed again as a symbol.

You can use the options Moveable and Show on demand when you edit the chart. But in the Web these options cannot be used, i.e. these options are ignored when you publish the graphic.
Removing Legends

You can also remove legends by clicking on the outermost border of the legend with the right mouse key and choosing Delete in the context menu.