diff --git a/fleet/andel/srcCommonMain/andel/editor/MutableEditor.kt b/fleet/andel/srcCommonMain/andel/editor/MutableEditor.kt
index 429db79396ad..04e949b59ff9 100644
--- a/fleet/andel/srcCommonMain/andel/editor/MutableEditor.kt
+++ b/fleet/andel/srcCommonMain/andel/editor/MutableEditor.kt
@@ -150,6 +150,8 @@ interface EditorLayout {
 
 interface MutableEditorLayout : EditorLayout {
   fun unfold(affectedFolds: List<Interval<*, Fold>>)
+
+  fun toggleFolds(add: List<Interval<*, Fold>>, remove: List<Interval<*, Fold>>, isConfirm: Boolean = false)
 }
 
 // Order is significant: the greater index, the more specific is the command type
diff --git a/fleet/andel/srcCommonMain/andel/editor/SimpleEditor.kt b/fleet/andel/srcCommonMain/andel/editor/SimpleEditor.kt
index d9eaf2d8f6a5..7ce50dc12122 100644
--- a/fleet/andel/srcCommonMain/andel/editor/SimpleEditor.kt
+++ b/fleet/andel/srcCommonMain/andel/editor/SimpleEditor.kt
@@ -120,6 +120,8 @@ data class SimpleEditorLayout(
   }
 
   override fun unfold(affectedFolds: List<Interval<*, Fold>>) {}
+
+  override fun toggleFolds(add: List<Interval<*, Fold>>, remove: List<Interval<*, Fold>>, isConfirm: Boolean) {}
 }
 
 class SimpleEditorLayoutComponent(var state: SimpleEditorLayout) : DocumentComponent {