I've been messing with this to make sure I could give a correct answer and stumbled upon something strange, had a private conversation with TheSteffen about this and he confirmed the same thing happened to him....
If you change this and try to force it to every user (ignore profile settings), the admin will not see the change if his profile is set to see the subforums at index-page (only if his profile settings are the same as set in
ACP!)
However a normal user will get his settings in profile ignored/forced
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