Unreal Engine - Move property category in details panel

YourActorClassDetailsCustomization.cpp

// Copyright XYZ. All Rights Reserved.

#include "YourActorDetailsCustomization.h"
#include "DetailLayoutBuilder.h"

void FYourActorClassDetailsCustomization::CustomizeDetails(IDetailLayoutBuilder& DetailLayout)
{
  // Category Name is display name of Category you want to move
  // ECategoryPriority is "how high" it should be.
	DetailLayout.EditCategory("Category Name", FText::GetEmpty(), ECategoryPriority::Important);
}

TSharedRef<IDetailCustomization> FYourActorClassDetailsCustomization::MakeInstance()
{
	return MakeShareable(new FYourActorClassDetailsCustomization);
}

YourActorClassDetailsCustomization.h

// Copyright XYZ. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "IDetailCustomization.h"

class FYourActorClassDetailsCustomization : public IDetailCustomization
{
public:
	// Makes a new instance of this detail layout class
	static TSharedRef<IDetailCustomization> MakeInstance();

	// IDetailCustomization interface
	virtual void CustomizeDetails(IDetailLayoutBuilder& DetailLayout) override;
	// End of IDetailCustomization interface
};

YourEditorModule.cpp

#include "YourEditorModule.h"

// .... your code

#include "YourActorClassDetailsCustomization.h"

#include "YourActor.h"

// .... your code

void FYourEditorModule::StartupModule()
{
  // .... your code
	// Register the details customizations
	{
		FPropertyEditorModule& PropertyModule = FModuleManager::LoadModuleChecked<FPropertyEditorModule>("PropertyEditor");
		PropertyModule.RegisterCustomClassLayout( AYourActor::StaticClass()->GetFName(), FOnGetDetailCustomizationInstance::CreateStatic( &FYourActorClassDetailsCustomization::MakeInstance ) );

		PropertyModule.NotifyCustomizationModuleChanged();
	}
  // .... your code
}