I know it is an anthropolytic question how we understand timeline: Vertical or Horizontal? Sometimes depends on culture and we must respect it. But for spacing reasons I prefer horizontal

You could place it under the resolutions panels, so you can show/hide whenever you want, but have more space (or you could make draggable and resizable panels)

Also many animation software has horizontal timeline (video editing, animation editing): Adobe or many Figma plugins as example.

Also better time control and easier for Drag & Drop