Add a "hidden in editor" group that causes all nodes in that group to be shown when the level loads.

world.tscn

@@ -41,8 +41,9 @@
 process_mode = 1
 scale = Vector2(1, 1.0155824)
 
-[node name="Player2D" parent="." unique_id=889851478 instance=ExtResource("1_aqk2v")]
+[node name="Player2D" parent="." unique_id=889851478 groups=["Hidden in editor"] instance=ExtResource("1_aqk2v")]
 unique_name_in_owner = true
+visible = false
 position = Vector2(-4833.9995, 356.4457)
 rotation = 0.0005533503
 safe_margin = 0.08
@@ -443,7 +444,7 @@ position = Vector2(1368, 401)
 [node name="LongBlock11" parent="Tutorial" unique_id=1016724328 instance=ExtResource("6_dwbse")]
 position = Vector2(1149, 629.44025)
 
-[node name="CanvasLayer" type="CanvasLayer" parent="." unique_id=1637221343]
+[node name="CanvasLayer" type="CanvasLayer" parent="." unique_id=1637221343 groups=["Hidden in editor"]]
 visible = false
 
 [node name="RichTextLabel2" type="RichTextLabel" parent="CanvasLayer" unique_id=1254950785]
@@ -1354,6 +1355,8 @@ position = Vector2(-4866, 311.15155)
 position = Vector2(-5189, 322.96738)
 
 [node name="HiddenHorizontalMovingBlock" parent="." unique_id=821525141 instance=ExtResource("35_6ah6f")]
+visible = false
+modulate = Color(1, 1, 1, 1)
 position = Vector2(-5294, 414.54047)
 
 [node name="QuadrantC" type="Node2D" parent="." unique_id=1197446130]
@@ -2305,15 +2308,23 @@ position = Vector2(-71, -450.97263)
 disk_num = 3
 
 [node name="HiddenHorizontalMovingBlock" parent="QuadrantC" unique_id=521432634 instance=ExtResource("35_6ah6f")]
+visible = false
+modulate = Color(1, 1, 1, 1)
 position = Vector2(-720, -912.7766)
 
 [node name="HiddenHorizontalMovingBlock2" parent="QuadrantC" unique_id=406601912 instance=ExtResource("35_6ah6f")]
+visible = false
+modulate = Color(1, 1, 1, 1)
 position = Vector2(-481, -477.55835)
 
 [node name="HiddenHorizontalMovingBlock3" parent="QuadrantC" unique_id=525687146 instance=ExtResource("35_6ah6f")]
+visible = false
+modulate = Color(1, 1, 1, 1)
 position = Vector2(-619, -477.55838)
 
 [node name="HiddenHorizontalMovingBlock4" parent="QuadrantC" unique_id=1059738582 instance=ExtResource("35_6ah6f")]
+visible = false
+modulate = Color(1, 1, 1, 1)
 position = Vector2(-367, -477.55832)
 
 [node name="HiddenTeleporter" parent="QuadrantC" unique_id=1585223156 instance=ExtResource("36_g1i3r")]