Make title field multiline in the add new custom post page?

You shouldn’t really be using the title for chunks of content. That title is used for things like generating URLs, for example, and it could be used for all kinds of things by the theme and plugins. That is almost certainly going to cause trouble.

I’d suggest you register your post type without ‘title’ support and create a custom meta box for you “raw news”, or just use the title for it is meant for– a title.

To answer the question directly though, the markup that generates the title section is hard-coded. You can’t alter it.

Related:

https://wordpress.stackexchange.com/a/105786/21376

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