I am currently using the cloud version of rStudio and I have no issues there. So clearly there must be a problem with the rStudio installed.
I understand why you might think that but as andresrcs hinted at. Rstudio is an Integrated Development environment for R, that makes it convenient to program in R, but is seperate and distinct from R itself.
In fact if you go to Rstudio's Tools menu, General , you will see a box to select the R version to use.