1
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data = Get["http://t.cn/RSzJjcb"];
ListPlot[Values[data], PlotLegends -> PointLegend[Keys@data, LegendMarkerSize -> 10]]

enter image description here

But the the size of legend is too small.I try LegendMarkerSize -> 50 but not works.

But in the doc,this really works,so how to deal with it?

enter image description here

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It works if you explicitly define the list of colors as the first argument of PointLegend. (ColorData[97] is the default color scheme.)

colors = ColorData[97] /@ Range[Length[Keys@data]];

ListPlot[Values[data],
 PlotLegends -> PointLegend[colors, Keys@data, LegendMarkerSize -> 20]
 ]

EDIT: You don't event have to explicitly define the list of colors, only its ColorData number.

ListPlot[Values[data],
 PlotLegends -> PointLegend[97, Keys@data, LegendMarkerSize -> 20]
 ]

plot

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