Floor level too low on Quest 3 and will NOT adjust

When setting the floor level, you can also use the thumbstick on the controller to raise or lower the floor. The cage boundary is because you opted to set a room boundary instead of a stationary boundary. If you want to play seated, then set a stationary boundary instead. In room-scale play, the cage will only appear for your safety if you move too close to the boundary walls to let you know you are going to smack into something if you are not careful.