So you have to log the 3 minutes after "cancel IFR going visual" on the approach separate?
What a bizarre notion!
I assume "separate" (sic) in this case means "separately".
If the flight as a whole requires two pilots because part of it is IFR then all of the flight requires two pilots and they log it as such inits entirety. Don't get too het up with divvying one flight up intp different legal blocks, you have to have the legal crew on board from start to finish in order t cope with conditions found en route. If the aircraft is singlepilot VFR, two pilot IFR then any amount of IFR on that flight requires two pilots. You can't start changing pilot requirements to and fro during a flight, what a daft idea! What would happen if the flight were in and out of IFR two dozen times? Is it reasonable, sensible or anything but utterly ridiculous to try divvying up the P1 and P2 duties according to when they popped in and out of cloud? A moment's thought indicates the daftness of that scenario.
You have to be a bit practical about it! Use common sense!