Hi, and welcome!
Anaconda is a wonderful environment and package manager for Python. I love it. It is, however, the source of many problems in dealing with R. I recommend uninstalling your current version and download the package manager image from the RStudio.com site.
Whether you do that or not, before you can load tidyverse or any of the other packages that aren't part of the base installation, you first have to download the library
install.packages("tidyverse")