I thought compound movements were the 10x10 focus.... and accessory movements were 2 or 3 sets till close to failure.
So I’d start out leg day with 3 sets of failure of hamstring curls then go into my 10x10 squat and finish up the session with 2-3 sets of leg ext and lunges.
back day would be 2-3 sets of pull-ups, followed by 10x10 of barbell, t bar, db rows.... then finish up with 2-3 sets of overhead ext or lat pulldowns
chest same concept except I’d alternate flat and incline with the 10x10 approach each individual session and finish up with cable crossovers and dips and decline press at 2-3 sets.
shoulders, I’d do 10x10 with db shoulder presses and finish up with 2-3 sets of delt movements and shrugs
and arms id just work in on the other days... but I never tried doing it with a 6 day approach... just 4 days on 3 days off (cardio)