The Outliner

Rows are grouped by kind within each level, with a count, for example Walls (26). Rooms, terrain and platforms and pads have groups of their own. Folding a group is remembered for the drawing.

Searching

Type into Search and the tree narrows to rows whose label contains your text, opening the ancestors of each match and scrolling to the first. Escape clears the field. Drag the divider labelled Resize the Outliner to give the box more or less room.

Hiding and locking

Each row has an eye to Hide or Show it, a lock to Lock or Unlock it, and a Camera snapshot button. If the row is part of a selection, hiding and locking apply to the whole selection. The same commands are in the right-click menu. A row locked by its layer reads Locked by its layer, and the layer decides.

When several things are selected, a tally at the foot of the box has a Clear selection control.