who makes the final decision on the blocking of the actors
Blocking (stage) In contemporary theater, the director usually determines blocking during rehearsal, telling actors where they should move for the proper dramatic effect, ensure sight lines for the audience and work with the lighting design of the scene.
Theatre director From Renaissance times up until the 19th century, the role of director was often carried by the actor-manager. This would usually be a senior actor in a troupe who took the responsibility for choosing the repertoire of work, staging it and managing the company. This was the case for instance with Commedia dell'Arte companies and English actor-managers like Colley Cibber and David Garrick.