If they don't have "DR", maybe you can assign focus to LEFT.
4231 is a defense formations normally and you may can try to set up your tactics as followings:
Team Mentality: Normal / Defensive
Focus Passing: LEFT/ Down both Flanks
Force Counter-Attacks: Yes
Pressing Style: Low
Tackling Style: Normal / Hard
Passing Style: Mixed / Long
Marking Style: Zonal
Offside trap: None