My problem: I have a point layer with a symbol size of 15958 meters. On the map they are all correctly displayed. When designing the map in the print composer and adding a legend, the symbols in the legend of this layer are not anymore displayed correctly. The outline seems to be cut on the right and the bottom side (see graph). The problem still exists when removing the outline. Unfortunately I wasn't able to find any solution on this issue.
Have you tried increasing the
Symbol space and the
Icon Label space in the Spacing menu of the legend? Those control the gaps between rows and between the icon and the label.
Alternatively, you can duplicate the layer, style it with normal sized round icon with the equivalent colors, hide it from the map, but show it in the legend instead of the current one.