The visual editor should be removed from the Beta Features section of Special:Preferences and placed in [[Special:Preferences#mw-prefsection-editing]]. This would ideally be done without changing anyone's preferences (whether default or personal).
https://www.mediawiki.org/wiki/VisualEditor/Rollouts#Other_projects (not guaranteed to be up to date) lists non-Wikipedia projects that still have the preference in the Beta Features.
Related tasks to be aware of (not all of which directly affect this task):
T197282: Rephrase "Temporarily disable the visual editor while it is in beta" in Special:Preferences
T202921: Re-design the Editing preferences to make it easier to pick the editing environment that you want to use
T197487: Change the display of the preferences related to the 2003/2006/2010 wikitext editors when the user has the 2017 wikitext editor enabled