Historical Rules · 18 November 2022
Rule 704.5u
Official source text from the 18 November 2022 Rules release
If a permanent with space sculptor and any creatures without a sector designation are on the battlefield, each player who controls one or more of those creatures and doesn’t control a permanent with space sculptor chooses a sector designation for each of those creatures they control. Then, each other player who controls one or more of those creatures chooses a sector designation for each of those creatures they control. See 702.158, “Space Sculptor.”