What you see in your viewport should be what's rendered. That's the way Poser works. It renders with the active camera, rather than like Blender which has a set camera for rendering that may not match the current view angle. The only time I've found that didn't happen was when I was using a multi-camera set up from one of the viewport display options.

It's possible it the scene is very large or very small and you need to adjust the hither and yon. That's how close or far something can be from the camera and still show up.

If you mean there's something in the way when you render but you don't see it in the preview, it could be a one-sided object. You'll need to go into your render settings preview and uncheck remove back-facing polygons. This is most common with walls and ceilings.

Finally, if you mean the aspect ratio isn't the same, you'll need to set the render dimensions to match the viewport ones. Or you look for the darkened area to see where the out of render area is. If you look at my example below, you can see two thin strips on either side. That section won't render.

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I use Poser 13 and win 10