unfortunately, double tapping the divider (when it works, which is not often), only flips the divider to the other side of the screen.
I will submit a ticket for display not filling. However, the fact that it is 'usually temporary' is more unsettling than reassuring. This is a live environment tool. Inconsistencies are not a welcome quality in live environments.
In terms of the columnar layout, it seems a bit of a clunky response to the issue of multi-editing, causing a larger problem than it seeks to solve. There is an established UX tendency towards preserving screen real estate, rather than sectioning it off and trying to jam everything onto the one screen. However, rather than just ranting (which is my default position

), I'd like to offer some potential solutions.
:: Why not consider implementing a pull out contextual menu from an edge? For example, if you're in a song edit screen pulling from the right opens a list of the songs, (with the current song being in the center, previous songs above, next songs below). User can then thumb scroll to the next song and release the menu to gain full screen editing capability again. Pull from the left, and you get the main menu. Select, release, disappear. Depending on the screen you are in (live view, edit mode, etc.) the right edge menu remains contextual to that application.
:: Alternatively, as a low-fi solution, in the edit mode, add a sliding banner of songs across the bottom or top that allows the user to move between songs, but maintains the editing feature.
:: Or, super low-fi - add <-- Previous Song Next Song --> buttons to allow users to move through songs in the edit mode.
Any of these would provide a similar solution, but preserves the full-screen status of the primary screen.
Just some thoughts.
Thx

T