端的にUnrealC++から以下のコンポーネントを追加します。

ActorComponent
SceneComponent

#include "MyActor.h"
#include "Components/StaticMeshComponent.h"
#include "GameFramework/FloatingPawnMovement.h"

// Sets default values
AMyActor::AMyActor()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	// Sceneコンポネントをアタッチ
	Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
	RootComponent = Cast<USceneComponent>(Mesh);

	// Actorコンポネントをアタッチ
	FloatingMovement = CreateDefaultSubobject<UFloatingPawnMovement>(TEXT("FloatingMovement"));
	AddOwnedComponent(FloatingMovement);
}

これが

こう

是非試してみてください～