Here is the XP2 ERF mode...
That is with the EVF square being the lower zoomed in view. You can also have focus peaking active in that square. If you are in monochrome mode (ACROS IS NICE) that square is monochrome so the red focus peaking will really jump out. You can focus basically by watching for red in that corner.
You can also have the digital rangefinder function in that corner but that one is harder to see at that size.
BTW, you can also have it show the full captured view to check overall focus and framing.
The XP2 framelines are more accurate than the XP1.
The ERF mode works in manual focus and single point AF. It also works fine with adapted lenses.
Shawn