Walls are provided under each object as Colliders. I suggest you review the LevelImposter Docs under Making Colliders for more information.

I'm sorry, but I think you closed this issue way too quickly.
That part in the help document is telling me how to make collisions with already created rooms/objects.

I was asking about vertical and horizontal walls, as well as corners to create custom buildings.
And if the help document does tell me how then I'm not understanding it.

I'm sorry, but I don't believe I am understanding. By "Walls" do you mean physical barriers that prevent players from phasing through rooms or do you mean a sprite/image that looks like a wall?

For physical barriers, the LevelImposter Docs from #14 describes how to make them under "Making Colliders". This documentation applies to both pre-made objects and custom objects.

If you are looking for sprites or images that looks like walls, you are free to draw then upload your own sprites by clicking "Add Sprite" in the top right corner. The only sprites/images we provide are those that are built into the Among Us game.

Closing due to inactivity