xaringan help screen creates endless loop Mac

In the IDE, I called up the Xaringan help presentation from the author. Now, it won't go away and constantly is trying to create new windows which it does in Safari. I didn't have this problem on Windows, but on Mac, it has stopped my working at all. Any ideas? As part of this, where on the Mac does RStudio IDE put its subsidiary files? I've tried to reinstall RStudio, but it doesn't wipe out the old settings, even using CleanMyMac to remove the offending copy of RStudio.
Thanks

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