main door. Maybe just type door 1 or international departure.

1st you need to check in before arrived at airport.

2nd go to the big TV screen upon arrived at departure hall and see where is your bali check in counter.

3rd go to the counter. they will have multiple counters for those not check in, checked in but bag drop or self bag drop.

don't have to worry too much. staff there will help you. make sure you arrive slightly earlier.....there could be LoOOOOOOOOOOG walk to yr departure gate.
also pls be remained that after customs and immigration, you will find eateries and apa apa shops. if you need to eat, pls eat there......after that there wont be shops along the way to yr departure gate.....

all I can say is KLIA 2 is suck big times.

additional info

if you are departure from bali (on yr way back), if you are smoker, good luck. customs will consfisicate most lighters safed for one type of lighter from the US.

gRAB is still consider NOT THAT LEGAL in bali. they are fly by night type of biz and proper taxi drivers hated grab driver.
you can get GRAB from airport to hotel, but other areas such as UBUB there wont be grab.....

GRAB is 1/3 of the price of taxi...….taxi really cut yr throat there,