Configuring peekable content

In v12 there is now peekable content, can you please clarify how its enabled by content type?

Additionally in the stock widgets such as forum thread list should it show a summary of the post when hovering over an item ? 

e.g.

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  • Hi Mathew, thanks for the reply. I reverted the User - Hover widget to factory default and now we see the Hover - Previews widget in the Widget Studio.

    It doesn't look like the "Peekable Content" is displaying properly for us. When we hover over an @mention to content, the text is overlapping and the background is transparent. Can you take a look at the video below? I'm wondering if this is a bug or if this is something that needs to be configured.

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