To add to the answer a bit: based on number of problems people have with Anaconda's version of RStudio on this forum, I would highly advise not to use it at all. Installing RStudio and R packages is straightforward and you won't depend on third party to update either.
And maybe for my own curiosity - where do you come across instructions to install RStudio through Anaconda? In my bubble I have never seen anyone recommend doing so, so I'm very curious what would be the reason for that.