Need to change maxextent clause on a object type colomn stocked in lob segment

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The table : 
DBMS_METADATA.GET_DDL('TABLE','JTF_PF_REPOSITORY')
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 CREATE TABLE "APPS"."JTF_PF_REPOSITORY"
  (    "PAGEOBJECT" "APPS"."JTF_PF_PAGE_OBJECT" ,
       "OBJECT_VERSION_NUMBER" NUMBER NOT NULL ENABLE,
       "CREATED_BY" NUMBER(15,0) NOT NULL ENABLE,
       "CREATION_DATE" DATE NOT NULL ENABLE,
       "LAST_UPDATED_BY" NUMBER(15,0) NOT NULL ENABLE,