Magical-Garden/Assets/Script/EditorFlags.cs

using UnityEditor;
using UnityEngine;

public class EnumFlagsAttribute : PropertyAttribute
{
    public EnumFlagsAttribute() { }
}

[CustomPropertyDrawer(typeof(EnumFlagsAttribute))]
public class EnumFlagsAttributeDrawer : PropertyDrawer
{
    public override void OnGUI(Rect _position, SerializedProperty _property, GUIContent _label)
    {
        _property.intValue = EditorGUI.MaskField(_position, _label, _property.intValue, _property.enumNames);
    }
}