Did Sai's influence end when he left his physical body? What does the text say about his presence now?

No, Sai's influence did not end with his physical passing. Chapter 45 clearly states that while 'the body went, the form went,' He remained in the Unmanifest just as He was. This indicates a continued, non-physical presence. The text further supports this by mentioning that the stories, or 'Leelas,' that occurred after his body passed away are infinite and well-known. This confirms that His presence and miraculous activities continued, and the author notes the great fortune of being born in the era of Sai's incarnation, implying His influence transcends his physical lifetime.