Mobile timeline sidebar
The sidebar on a timeline allows users to mute or solo individual rows in a timeline. This is extremely useful for testing out sounds in a music piece, or generally for isolating components of an animation or other timed sequence. Currently the sidebar resides always on the left hand side of the timeline, which is fine for short timelines, but quickly becomes unusable on longer ones. It is both a hassle to have to scroll back and forth a large distance to toggle a row on or off, as well as being difficult to discern which sidebar button corresponds to which row at large distances. A muted row will distinctly be “greyed out” to highlight that it is off, but this effect is in my opinion too subtle at larger scales, especially due to the fact that the timeline is largely obscured by the elements placed on it. My suggestion is to have the sidebar somehow follow the player, perhaps sliding along the timeline and resting on the left hand side of the screen. This would allow it to be better accessible on larger projects, and would make it easier to discern which row toggle corresponds to which row. I am not sure of the exact way that this should he implemented, as the sliding sidebar may prove to be annoying to work with, but perhaps the default setting could set the sidebar as it currently behaves, and an additional toggle could be added to enable it to be mobile. Additionally, a row could be even more grayed out when disabled, to make it absolutely clear that it is off. (On a side note, the ability to keyframe the on/off and solo sidebar buttons would be extremely useful)
Attached is an example of the problem.