I took the CCIE Lab in 2018 and 2019, all attempts were in Tokyo. I assume it has not changed much since that time and I also believe the experience is consistent across all other Lab locations.
You are not allowed to bring anything inside exam room. The only exception is medication. You will be provided bottle of water, coffee from machine is available as well. You can leave exam room to go to toilet anytime, however only one person is allowed to leave room at a time and you can only use toilet on the same floor. If you have for example runny nose, proctor can provide you paper tissues as well.
Dual monitors are there and Cisco documentation is available via shortcut on desktop. Proctor will give you demo how to navigate through documentation before exam.
I hope this information helps!