A quieter header and a clearer focused session on the wall
The header no longer shows the efficiency link, the wall switch is an icon alone, and the focused wall session reads as selected.
The top-right corner of a session no longer carries the live efficiency numbers. Efficiency is still one click away in its own tab of the side panel.
The wall switch now shows its icon and the switch, without the word beside it. Its name is still read out by screen readers.
On the wall, the session you are working in now rises in the same deep, selected style as other chosen controls, so it is easy to tell from the others.