You can't do this. The defending system originally changed in FIFA 12 and since then, Ultimate Team has never had the legacy defending system enabled.
Answers HQ Hero - Please read sticky topics in your game category before posting your issue. If you have a Answers HQ-related problem, please feel free to PM me for help. I don't offer game support via PM, however, requests for such will go unanswered. XP = Thanks for helping. Accept as solution = This solved my problem!
Please be aware I am not an EA employee, merely a volunteer moderator/helper. I cannot move your case along further or credit you back with coins/players.