How can I remove type annotation help when using rust-analyzer?

Update Sept 2022.

They now use VSCode builtin inlay function from 1.67

I setup mine as follow:

{
  "editor.inlayHints.enabled": "offUnlessPressed"
}

Then you can toggle them with Ctrl+Alt pressed.

Old Answer

There is now a togglable command (Ctrl+Shift+P) : Rust Analyzer: Toggle inlay hints