I customized results in the dashboard for a number of queries. When I test those queries with their prefixes (like "libr" when I configured the term "library") in the autocomplete, the results do not match my changes. Why is this the case?
The autocomplete dropdown does respect the result ordering to the extent that it can. Since pinning is done for a fully typed query term, the autocomplete results will only reorder when that word is completed.
For example, say you pin a result for the query "library" in your engine. If you are typing that word, you will see a result match for the prefix "libr", but the full customization configuration will not appear until you complete typing the word to "library". Once the customized term is entered into the search input, you will see the custom ordering you specified in the autocomplete drop-down.