If you already know how the track should sound, you can say so and get it back that way. Direction is the last control in the composer's option row, and it sets how closely your brief is followed, for the music and the picture both.
On is the default, and it works like a film composer reading a script. The look of your scene goes to the picture, and the music picks up what you'd hear or feel standing there. Write "a rainy Tokyo alley with neon signs" and the neon lands in the visuals while the rain and the late-night mood land in the score. Anything you didn't mention, tempo, arrangement, key, gets chosen for you, and every track then shares that tempo and key while the lead instrument changes, so an hour never blurs into one song. Leave Direction on when you know the vibe but not the tracklist.
Turn it Off when you can already hear the track in your head. Your words are followed as written, for the music and the picture, and nothing is added on top. The whole scene you painted feeds the music too. "Slow nylon guitar over soft rain, 70 BPM, no drums" comes back as that. Say nothing about the audio and nobody writes a tempo or a key for you either; the music goes on your scene and your genre alone.
Either way your genre carries through, from lofi to metal, and a stated absence is a hard rule, so "no drums" means no drums. Name a real artist, song or album and only the style it suggests reaches the music, never the name. Your own section tags, like [Intro] or [Chorus], reach every track word for word; Write a brief that gets the video you want shows how to write them.
If one track misses, you don't have to make the video again. Each track re-rolls on its own in Studio, using only the usage for that one track, and Re-roll music, visuals or the thumbnail has the steps.