New answers tagged legend
You can just go to Legend items and right-click the subgroup that you want to hide and click on Hidden. This will do what you are asking for.
Just for anyone that may still be looking around for an answer to this issue, I havent managed to find a feature within QGIS either... but i have figured an effective way of compensating for the issue. I simply add an image box into the Print Composer and use an corresponding image (Usually .SVG files) to cover the previous symbol that is too small. I ...
If you uncheck 'auto update', you can remove individual legend items or groups.
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