Is there any way to set code_folding: show overall but set certain chunks to hide by default? (not echo=FALSE because that would never show the code). The use case is wanting the code for most chunks to show by default (with a "hide button") but wanting some plotting code chunks to hide by default (but be available with a "show" button).
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I think it is still a feature request in rmarkdown 
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Added +1 to the request. Thanks for the tip.
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I was looking for something similar and came across this post on stackoverflow which works quite well:
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