What is the Red Zone Riser section for U2 at The Sphere?

For U2's 2023 and 2024 shows at The Sphere, there is a large general admission area in front of the stage. The farther back you are in this area, the more difficult it can be to see over other fans. As a result, there is a general admission section on the floor that is raised. This is the Red Zone Riser section. You'll be guaranteed a clear view of the stage, but you won't be as close.