What is the best way to set a SubLevel as Editor Only?

[ByungHo.Choi]

I am using a world composition and wanna make some of my sublevels as editor only, so it will not be cooked.

Making every actors in the level as editor only is not an option,
because of placing new actors in that sub level will not be automatically set to be “editor only”.

I managed it to be possible by moving those sub levels to a different folder,
and make that folder as “Directories to never cook” in Project Settings/Packaging.

But I wanna make sure if there is any other way.
What is the best way to set a sublevel (in world composition environment) as editor only?

[ByungHo.Choi]

Thank you for your answer, Bleeck.
but I cannot see most of those check boxes in WorldComposition environment.
this is a new project. and I made a level as World Composition enabled.
and then other sublevels look like this in Levels panel.

how can I make those check boxes available?

[ByungHo.Choi]

Thank you for your answer, Bleeck.

but I cannot see any related checkboxes in my Level Detail panel.
I cannot see any of those check boxes from WorldTileDetailsCustomization.cpp either.
How can I make it available?