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center setting per world in settings.ymlsettings.yml setupCustom centers for two worlds, for example a lobby and a survival world:
# center: Sets where the pregen spiral starts.
# - 'default' uses the world border center, or the world spawn if no border center is set.
# - '~ ~' always uses the current world spawn.
# - 'x z' uses fixed block coordinates, for example: "0 0" or "1500 -500".
lobby:
auto_run: false
task_queue_timer: 60
parallel_tasks_multiplier: auto
print_update_delay: 5s
radius: 3000b
center: 0 0
survival:
auto_run: false
task_queue_timer: 60
parallel_tasks_multiplier: auto
print_update_delay: 10s
radius: 15000b
center: 1500 -500
Note: Tested only on Paper, and Purpur 1.21.10 so far. Please report any issues you encounter here.
If you are interested you can check out the more detailed updated release notes here

Fast and Efficient Async Minecraft World Pre-generator