Hi Lily,
I just tried that exact code:
...
theme(axis.title.y = element_text(size = 10)) +
...
in a ggplot2 plot and it worked for me, so it's likely that something else specific to your code is the issue (or perhaps that you're not running the latest ggplot2 version).
If you're sure you have the latest stable version of ggplot2, please provide a reproducible example. That would help the list help you.
Best,
Sherif
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