ggplot2 - How do I increase the minimum dot size in Seurat's

I want to use the DotPlot function from Seurat v3 to visualise the expression of some genes across clusters. However when the expression of a gene is zero or very low, the dot size is so small that

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ggplot2 - How do I increase the minimum dot size in Seurat's

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How do I increase the minimum dot size in Seurat's DotPlot