Undo, redo, delete, lock, isolate, focus, and grid

The editor includes utility controls for safer editing.

• Undo steps back through recent recorded changes.

• Redo reapplies a change after undo.

• Delete removes the active selection.

• Lock prevents accidental movement of approved objects.

• Isolate temporarily hides everything except the selection.

• Focus Selected moves the camera to the selected object or group.

• Toggle Grid shows or hides scale guidance.

Lock important objects after approval to avoid accidental layout changes.