Overriding legend symbol size in ggplot

Question

I am trying to override my symbol size aes using commands I have found in this forum and elsewhere. I can get the alpha override to work but not the size.

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Answer 1

Your alpha override is overwriting your size override. Change this:

guides(colour = guide_legend(override.aes = list(size=5))) +
guides(colour = guide_legend(override.aes = list(alpha = 1))) +

to this:

guides(colour = guide_legend(override.aes = list(size=5, alpha = 1))) +

In the future, please try to include minimal working examples. This means both providing data (to make it a working example) and also not bothering with things like all your optns (to keep it minimal).