When you use Advanced Search, there is an option at the bottom to choose your sort order: you can sort by Filename, Date Modified, Location or Relevance Ranking.

The default is Relevance Ranking, which –to me at least – is by far the least useful, since, unlike the others, it basically reorders the files you’re searching in with every search, so you never know what order your files are going to be in.

And there’s no way to change the default (as acknowledged by an Adobe employee here: https://community.adobe.com/t5/acrobat/advanced-search-default-sorting-acrobat-pro-dc/m-p/9914022).

And then even if you choose another option, Acrobat FORGETS this immediately once you search for a different term. Goes straight back to Relevance Ranking. Extremely frustrating when you’re performing many sequential searches and would really like to have the files you’re searching in appear in the same order every time.

The entire Advanced Search window is a huge mess of terrible UI design and missing functionality, but the inability to have ANY kind of impact on how your search results are listed is probably the worst. It makes Advanced Search an absolute nightmare to work with.

PLEASE fix this glaring omission!