Identify the scope you are about to change
Imagine one local film that matches poorly while the rest of the collection is correct. The source is the parent location containing many titles; the movie folder is the individual location underneath it. Kodi’s source guide documents different controls depending on which is selected. Read the path in the dialog before changing the information provider, rather than assuming a highlighted title and the whole source are interchangeable.
Use the documented single-title arrangement
The video-source manual describes Selected folder contains a single video for a movie folder and an equivalent single-show setting for a television-show folder. The management guide specifically warns that changing a source scraper to fix one item can overwrite a library unintentionally. It recommends a separate source or applying content settings at the actual video folder when that is the intended exception.
Keep the decision reversible and verify the match
Record the original scraper and source settings, then use one clearly identified item as the check. Inspect its title, year and synopsis after the refresh instead of judging only by a new poster. If a dialog proposes refreshing every item under a broad path, stop and reconsider the scope. The goal is to improve one metadata match while retaining correct neighbouring entries, not to change the playable video or create a new catalogue by accident.
Questions, answered
Should I change the whole source provider for one unusual film?
Use the documented individual-folder or separate-source approach where appropriate; a broad source refresh can affect the rest of the library.