Hi, welcome 
I think this is not a setting but rather an internal Wappler change that led to this different behavior. In that perspective, as an end-user you can't change that.
I believe there were some talks about this before and it was also explained why the change happened. I believe it's because before it was pseudo-SQL generation by Wappler and now it's a real SQL query preview as given by Knex - the underlying DB library.