Feature request #17465
Being able to set a title for diagram categories
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Apply a categorized style to a layer.
Then set a pie chart diagram on it.
In the attached image, the Item1 and 2 are the colors shown in the pie chart but even if you detail what they are in their label, I think you miss some information (what is the information you are representing).
It could be nice to be able to set a global label for this classification. And it makes sense in the legend composer (To do that currently, you need to split the legend and insert custom texts).
Also note the small size of the Items' symbols.