Lego Rebrickable. This set has three sections to build which are intended to be build by three (or more) people, where everybody has a own separator.

Brickset & Rebrickable alternate LEGO builds

LEGO MOC Orange Separator Corner Facade by Brick Artisan

Blog Rebrickable - Build with LEGO

LEGO Set 190-1 Farm Set (1975 Building Set with People)

Build It! Volume 3: Make Supercool Models with Your LEGO Classic Set (Brick Books, 3). Professionally spiraled and resold by a third party. This

Build It! Volume 3: Make Supercool Models with Your LEGO® Classic Set (Brick Books, 3)

LEGO Set 10273-1 Haunted House (2020 Icons)

LEGO MOC Ninjago City Extension: The Spinjitzu Dojo by cjtonic

LEGO Set 31137-1 Adorable Dogs (2023 Creator > Creator 3-in-1)

LEGO MOC Creator Modular 6754 by Danielle