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Blueprint Setup

  1. Open your Character Blueprint
  2. Add Component → Hotbar Component
  3. Configure properties, for example:
    • Max Slots: 9
    • Auto Refill Enabled: true
Optionally link to the main inventory in BeginPlay: 
Event BeginPlay
   ↓
Get HotbarComponent
   ↓
Set Player Inventory
   Inventory: [Main InventoryComponent]

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C++ Setup

// In Character.h
UPROPERTY(VisibleAnywhere, BlueprintReadOnly)
UHotbarComponent* HotbarComponent;

// In Character.cpp constructor
HotbarComponent = CreateDefaultSubobject<UHotbarComponent>(TEXT("HotbarComponent"));
HotbarComponent->MaxSlots = 9;
HotbarComponent->bAutoRefillEnabled = true;

// In BeginPlay
void AMyCharacter::BeginPlay()
{
    Super::BeginPlay();
    HotbarComponent->SetPlayerInventory(InventoryComponent);
}