Anaconda using environments where you can set different modules and versions to be used.
The idea is, that if you happen to work on different projects, you might have different modules and libraries and versions in use for various reasons (dependencies in short). For example there might be a project which was created 5 years ago and used Python 2 with some old versions of libraries. Some methods might be deprecated, renamed or reworked. But nobody has the time nor need to update the code to the most recent Python version - so instead if you develope for it, you set an environment with the older versions. This way if the code works on your side, it will work on the other side.
This means after installing a module, you need to navigate to the environment in Anaconda and add the library to your current environment.