hide message list but not the message viewer

Hello,

I've searched for but couldn't find an option to hide the message list, to use the full window height for reading the selected message, ideally commanded through a shortcut. That ought to be faster than opening the message in an external window and resize that window (though evidently an external window might be resized taller than the kmail/kontact main window).

I take it such a feature has not yet been foreseen?

R.
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