clarify wording

Co-Authored-By: Ershn <[email protected]>

getting_started/first_2d_game/04.creating_the_enemy.rst

@@ -24,9 +24,15 @@ Click Scene -> New Scene from the top menu and add the following nodes:
 Don't forget to set the children so they can't be selected, like you did with
 the Player scene.
 
-In the :ref:`RigidBody2D <class_RigidBody2D>` properties, set ``Gravity Scale``
-to ``0``, so the mob will not fall downward. In addition, under the
-:ref:`CollisionObject2D <class_CollisionObject2D>` section, uncheck the ``1`` inside the ``Mask`` property.
+Select the ``Mob`` node and set it's ``Gravity Scale``
+property in the :ref:`RigidBody2D <class_RigidBody2D>`
+section of the inspector to ``0``.
+This will prevent the mob from falling downwards.
+
+In addition, under the :ref:`CollisionObject2D <class_CollisionObject2D>`
+section just beneath the **RigidBody2D** section,
+expand the **Collision** group and
+uncheck the ``1`` inside the ``Mask`` property.
 This will ensure the mobs do not collide with each other.
 
 .. image:: img/set_collision_mask.webp