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I generate maps from CSV to which I apply a style sheet.

In the stylesheet defines the set of items I may encounter.

But in most csv, there are not all the elements defined in style.

So I find myself with times 10 points of the same type on the map, but with a legend of 50 categories.

How to display the categories that are present on the

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The button you want is called "Filter legend by map content." Here's what it looks like in the main QGIS window:

enter image description here

Here's what it looks like in the print composer: enter image description here

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