Interactive Theme Editor Mode

The Theme Editor window is not the only way to build a theme. The Dungeon Theme editor mode lets you design a theme directly in the level viewport - drag a mesh onto a wall in the actual dungeon and it is attached to that marker across the whole level straight away, instead of dropping it into a graph and rebuilding to see where it landed

Entering the Mode

Build a dungeon in your level, then pick Dungeon Theme from the editor mode ribbon in the level editor

The mode works on the dungeon that is already in the level, so the theme you edit is the one assigned to that dungeon actor

The Tools

Tool	What it does
Select	The default tool. Picks marker nodes and spawned actors in the viewport
Marker Node	Drag and drop assets from the content browser into the viewport to attach them to the selected marker nodes
Visual Node	Modifies the actors associated with the visual theme node

Why use it

The graph view in the Theme Editor window shows you the structure of a theme. The viewport shows you the result. This mode collapses the gap between the two, which matters most when you are placing art that has to line up with the grid - trim, corner pieces, ceiling props - where the graph tells you nothing about whether the mesh actually fits

You are editing the same theme asset either way, so you can move between the window and this mode freely, and whichever one you use, the changes land in the same file