Hello to you.
It is not clear to me why the new vector was forced on all those who marked in preferences "to stay with the old vector". But let's leave it at that for now.
In the new vector, the "new section" button displays the "+" sign instead of "new section". A new (and an old) user does not understand the relationship to plus, minus, double, division, or differential equations.
The first thing I did in my wiki was run over the "MediaWiki: Vector-2022-action-addsection" page, but anyone responsible for disrupting this pest should remove it globally.
Thank you.