Clean up all created entities

[gritty locust]

This seems like a very basic question so I feel like there must be something I'm missing, but...

I have a very simple game structure where I want to go from the main menu (no ECS) into the game scene, then back to the main menu. It seems obvious that when I go back to the main menu I need to clean up all the entities in the World, but I can't see a nice way to do that.

EntityManager.DestroyEntity(entityManager.UniversalQuery) or EntityManager.DestroyAndResetAllEntities on the DefaultGameObjectInjectionWorld almost work, but they also kill the Physics singletons and other default entities.

Should I be creating my own World if I want to be able to go in and out of it, or is there a way to remove only the entities that are created as part of the game scene? Or am I thinking about this entirely wrong?

[errant jetty]

you just need to keep track of all loaded entities

via subscenes

for example

all subscenes you load = just unload them in the end

[leaden jetty]

As you have figured out deleting all entities is a bad idea as you'll destroy all the singletons as well

I'm personally a fan of just creating and destroying worlds as you enter and leave the menu as it cleans up all your memory

But you can just keep the world around forever and open and close subscenes instead of you prefer