Why can't I resize the YAML editor

When I’m editing a page’s YAML code, I would like to have an editor, which uses more than a third of my available screen width. Preferrably almost the full width. Fantastic would be a freely resizable editor.

[Edit: Firefox, Windows 10]

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If you double-click on the title it should expand to full width…

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LOL, I’d never guess… A dedicated button, any hint would be nice.

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Would be nice, but unfortunately it doesn’t.
(Firefox, Win10)

I’ve just tested Brave and Firefox on MacOS → it’s working, u need to double click the title.

True, it work for cards, also for me, and I also didn’t know that before.
But it doesn’t work, when editing the Yaml of a whole page.

FTR: Resizing does also not work for template sensors (‘Helpers’).
True, it’s not a Yaml-Editor, but for editing templates it would also be nice to have more screen space…