Should expanded search tools collapse automatically after searching?

We have a page with a list of elements and a hidden advanced search panel that slides down after the user clicks a button. With the advanced search panel hidden, the user will see two rows of results (8 items). After it slides down, the user will only see one row of results (4 items).

If a user fills out the advanced search form and starts a search, then should the panel slide up and close automatically so they have more space for the results, or should the search panel remain in place for the users to close it manually after they are done with searching?