PyLspInstall does not appear as the command

[arafune]

In the document, (https://github.com/williamboman/mason-lspconfig.nvim/blob/main/lua/mason-lspconfig/server_configurations/pylsp/README.md), PyLspInstall works as the command to install the third-party plugins for pylsp. I have installed pylsp by using Mason and it works well as the image attached shows.

However, I can not use the PylspInstall command. Could you let me know the points for fixing it?