Video studio
Edit your video on tracks: the song's parts with their looks, video tracks with words and shapes over them, the sound and the effects. Make it the shape each platform asks for and export it from here. It is the same video as Classic's Timeline.
Pick a look in Classic to see it here; the video tracks draw over it.
0:00.0 of 0:30.0
Time
Effects
V1 Sections
The project's look, until you add a track or a song.
Song
Drag a clip to move it, or its edges to trim it; on a focused clip, the arrow keys move it, Alt with an arrow changes its end, S splits it and Delete removes it. Undo covers every change, here and in Classic's Timeline.