You already know the right answer: provide an ORDER BY clause and the data will be sorted.
In SQL world there exists no order without ORDER BY.
The data preview doesn't provide ORDER BY per default, but you can get the SQL is uses to fetch the data.
Tables are not sorted, views are not sorted and - you get the gist here - information models aren't sorted either. It's always the SELECT that brings in the notion of sorting the output.
Really, you want sorting, then you provide an ORDER BY 
- Lars