When you set Aggressive Caddie to ON, Golfshot will guide you towards playing your longer distance clubs and cutting corners on doglegs on your Club Recommendations. Club Recommendations are only available for Pro members, so the aggressive caddie setting would also only affect these members.
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High-risk recommendations lead to shorter approach shots and may produce a better score but a misplaced shot could leave you in a hazard. To adjust, open Settings > General > Aggressive Caddie > set to suit your playing style.