Bug report #19282: Data-defined legend is broken if "map units" are used - QGIS Application - QGIS Issue Tracking
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How to create custom geometries based on vector shapes to use on the map legend or symbology on QGIS | LUCCHESE, L. V.
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QGIS Cloud: Permanent displaying the legend in a fixed location in QGIS Cloud QWC2 with CSS - Sourcepole
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