How can you insert suggestions on a PR in Azure Devops?

Question

I found this somewhat recent mention of experimental PR features, and they mentioned the ability to insert and apply suggestions from the PR itself.

That's a feature I've grown very accustomed to with other products, but I'm a bit lost as to how I can access this feature in Azure DevOps in the present day.

Here is what I actually see:

Answer 1

This feature should be enabled by default.

Open any pull request, navigate to the Files tab, choose the file and click a tooltip to enter a comment:

Now in the form that opens you'll see the button to add a suggestion: