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I'm using a pie chart map in which the size of the pie chart convey an attribute value (scaled size).
Is it possible to show this classification in the legend of QGIS 3?
Open the menu "Diagrams" and navigate to "Legends" entry. Click on "Legend Entries for Diagram Size..."
Choose "Collapsed Legend"
The legend will be displayed in layerlist and in printcomposer
Required, but never shown