My only complaint about the 2017 wikitext editor is that the 'Show preview' function takes up the whole height and width of my monitor screen; I don't need the preview to be that large.
Is it possible to have the 2017 wikitext editor's 'Show preview' function/preview page be exactly similar to the default/non-visual/non-2017 wikitext editor one?
Other than that, the 2017 wikitext editor is pretty great!