https://www.udemy.com/course/unreal-engine-5-gas-top-down-rpg 44. Infinite Effect Application and Removal

.cpp

UAbilitySystemComponent* ASC = UAbilitySystemBlueprintLibrary::GetAbilitySystemComponent(TargetActor);  
if (!IsValid(ASC))  
{  
	return;  
}

// Create a Query to specify the GE to be removed.
// Similar to the implementation of UAbilitySystemComponent::RemoveActiveGameplayEffectBySourceEffect, but with additional check by SourceObject.
FGameplayEffectQuery Query;
UAbilitySystemComponent* InstigatorAbilitySystemComponent = ASC;  
constexpr int StacksToRemove = 1;
Query.CustomMatchDelegate.BindLambda([&](const FActiveGameplayEffect& CurEffect)
{
	bool bMatches = false;
	if (CurEffect.Spec.Def && InfiniteGameplayEffectClass == CurEffect.Spec.Def->GetClass())
	{
		if (InstigatorAbilitySystemComponent)
		{
			const bool bDoesASCEqualToSpec = InstigatorAbilitySystemComponent == CurEffect.Spec.GetEffectContext().GetInstigatorAbilitySystemComponent();
			const bool bDoesSourceObjectEqual = this == CurEffect.Spec.GetEffectContext().GetSourceObject(); // additional check by SourceObject.
			bMatches = bDoesASCEqualToSpec && bDoesSourceObjectEqual;
		}
	}
	return bMatches;
});

// Use Query to remove GE from ASC.
// UAbilitySystemComponent::GetActiveGameplayEffects returns const, so we are forced to use const_cast.
const FActiveGameplayEffectsContainer& ActiveGameplayEffectsContainer= ASC->GetActiveGameplayEffects();
FActiveGameplayEffectsContainer& GEs = const_cast<FActiveGameplayEffectsContainer&>(ActiveGameplayEffectsContainer);
GEs.RemoveActiveEffects(Query, StacksToRemove);