Unable to remove “Magic Movie” name from video

I used iMovie to embed one of the available soundtracks into a time-lapse video (50 sec.) with my 15 Pro Max iPhone, everything worked out great other than I have been unable to remove the name “Magic Movie” from the finished video, tried everything even deleting iMovie app and reinstalling, still unable to remove the name “Magic Movie” from the lower left-hand corner of the finished video, please help!