You enter in the same place.
After you enter, it's a wide area people are just walking thru until they come to the amphitheater. There is sort of a rough line, but people are going at their own speeds, so it's not like you are following really, really close to everyone.
As you come in, the CM will tell you which side of the to be on. At one point, it was 'stay to the left' and they had CMs on the left to show people with
ECVs to their seats.
The last few times we have been, we were told to 'stay to the right' and soon after the stroller parking area on the right, there were CMs to show people with ECVs/wheelchairs to their spots.
This is different than the 'general' seating. People without wheelchairs/ECVs just keep walking in and CMs inside the amphitheater are doing traffic direction to keep people moving to vacant areas.
The wheelchair/
ECV seating is different; it's across the whole back row. The CMs keep track of which areas still have spots and direct you to a specific spot.