Mixing up R markdown shortcut keys in RStudio, or how to unfold all chunks

August 25, 2019
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When using R markdown in RStudio, I like to insert a new chunk using the shortcut Cmd+Option+I. Unfortunately I often press a key instead of “I” and end up folding all the chunks, getting something like this:

It often takes me a while (on Google) to figure out what I did and how to undo it. With this note to remind me, no longer!! The shortcut I accidentally used was Cmd+Option+O, which folds up all chunks. To unfold all chunks, use Cmd+Shift+Option+O.

The full list of RStudio keyboard shortcuts can be found here.

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