Congratulations on finding it and not sharing the where or how with others on web!!!
So for the others out there who also want to find the answer. Perhaps a more constructive conclusion to this post or a more reasonable answer to serve others in the future:
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The Zoom out option is part of Corona itself.
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Once Corona loads the preview screen, click on View > Zoom out
This will make the preview screen fit within your current window and no needless searching for hardware configuration in Corona or on your operating system is necessary.
Have a nice day.