This preview type is actually a render process and requires an active camera perspective (5 key):

RealFlow provides → physical camera settings and you can play with parameters like shutter speed, f-stop, or ISO values.
The size of the rendered images is controlled with the camera's “Width” and “Height” parameters.
If desired, adjust the playback range in the timeline (see timeline image above).
Materials can be applied manually for every node under Node Params > Maxwell Render > Material.
Lighting, image quality, sampling level etc. are adjusted under Render shelf > Maxwell Scene Preferences:

Click on Render shelf > Maxwell Preview
Once the frames have been rendered they are assembled and shown in the “Movie Player”.

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