Radar chart > Inherit Property Series
• Inherit Property from Series – User can select the legend shape by their own, after disabling this option.
• Go to Edit Menu > Formatting tab > Legend tab > Inherit Property from Series
• In AIV, default markers are enabled by default.
• Users can also change the legend shape by selecting any of the given shapes from series legend shape of the series property tab. (For that user need to disable default marker first)