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Yes the fullScreen render window part that you want to replace is just the following piece of code from the simple cone. The mapper setup, volume and so on should remain the way they were from your working example.

import vtkOpenGLRenderWindow from 'vtk.js/Sources/Rendering/OpenGL/RenderWindow';
import vtkRenderWindow from 'vtk.js/Sources/Rendering/Core/RenderWindow';
import vtkRenderWindowInteractor from 'vtk.js/Sources/Rendering/Core/RenderWindowInteractor';
import vtkRenderer from 'vtk.js/Sources/Rendering/Core/Renderer';
import vtkInteractorStyleTrackballCamera from 'vtk.js/Sources/Interaction/Style/InteractorStyleTrackballCamera';

// ----------------------------------------------------------------------------
// Standard rendering code setup
// ----------------------------------------------------------------------------

const renderWindow = vtkRenderWindow.newInstance();
const renderer = vtkRenderer.newInstance({ background: [0.2, 0.3, 0.4] });
renderWindow.addRenderer(renderer);

// ----------------------------------------------------------------------------
// Use OpenGL as the backend to view the all this
// ----------------------------------------------------------------------------

const openglRenderWindow = vtkOpenGLRenderWindow.newInstance();
renderWindow.addView(openglRenderWindow);

// ----------------------------------------------------------------------------
// Create a div section to put this into
// ----------------------------------------------------------------------------

const container = document.createElement('div');
document.querySelector('body').appendChild(container);
openglRenderWindow.setContainer(container);

// ----------------------------------------------------------------------------
// Capture size of the container and set it to the renderWindow
// ----------------------------------------------------------------------------

const { width, height } = container.getBoundingClientRect();
openglRenderWindow.setSize(width, height);

// ----------------------------------------------------------------------------
// Setup an interactor to handle mouse events
// ----------------------------------------------------------------------------

const interactor = vtkRenderWindowInteractor.newInstance();
interactor.setView(openglRenderWindow);
interactor.initialize();
interactor.bindEvents(container);

// ----------------------------------------------------------------------------
// Setup interactor style to use
// ----------------------------------------------------------------------------

interactor.setInteractorStyle(vtkInteractorStyleTrackballCamera.newInstance());

As you can see the vtkFullScreenRenderWindow save you quite some boilerplate code.