Discussion Array of Custom Class in Custom Inspector

I am trying to write code for custom inspector in which based on the bool value. One array of custom class will be visible. But In that I am not able to add or change array size using length input. Plus and Minus sign to add and remove object is working fine.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using System;
5. using System.Linq;
6.  
7. #if UNITY_EDITOR
8. using UnityEditor;
9. #endif
10.  
11. //Condition is my custom class ->
12. /**
13. public class Condition
14. {
15.     public ConditionDescription description;
16.     public bool isSatisfied;
17.  
18. }
19.  
20.  
21. [Serializable]
22. public enum ConditionDescription
23. {
24.     isEnter,
25.     secondCondition
26. }
27.  
28. **/
29. [CustomPropertyDrawer(typeof(Condition))]
30. public class ConditionDrawer : PropertyDrawer
31. {
32.  
33.  
34.     public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
35.     {
36.         return EditorGUIUtility.singleLineHeight * 2.5f;
37.     }
38.     public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
39.     {
40.         EditorGUI.BeginProperty(position, label, property);
41.  
42.         // Create the rect for our field
43.         var rect = new Rect(position.x, position.y + 4, position.width, 16);
44.         var rect2 = new Rect(position.x, position.y + 24, position.width, 16);
45.  
46.         var primeProperty = property.FindPropertyRelative("description");
47.         var secondaryProperty = property.FindPropertyRelative("isSatisfied");
48.  
49.         EditorGUI.PropertyField(rect, primeProperty);
50.         EditorGUI.PropertyField(rect2, secondaryProperty);
51.  
52.         EditorGUI.EndProperty();
53.     }
54. }
55.  
56. public class SomeBehaviour : MonoBehaviour
57. {
58.     public bool isVisible;
59.     public Condition[] conditions;
60. }
61.  
62. [CustomEditor(typeof(SomeBehaviour))]
63. public class SomeBehaviourEditor : Editor
64. {
65.     private SerializedProperty property;
66.  
67.     void OnEnable()
68.     {
69.         property = serializedObject.FindProperty("conditions");
70.     }
71.  
72.     public override void OnInspectorGUI()
73.     {
74.         serializedObject.Update();
75.  
76.         SomeBehaviour item = target as SomeBehaviour;
77.  
78.         item.isVisible = EditorGUILayout.Toggle(item.isVisible);
79.         if(item.isVisible)
80.         {
81.             EditorGUILayout.PropertyField(property, true);
82.         }
83.     }
84. }
85.