Can I frame the image, crop the main viewing area, or narrow the camera field? I'd like to reduce the size of viewable area.
Yes, you can crop the image, or narrow the camera field by using RECentral 4 (URL: https://www.avermedia.com/us/product-detail/RECentral_4), but it requires you have a gaming laptop/desktop (e.g., i5-6XXX for desktop or i7-6xxx for laptop, with a standalone graphics card such as GTX1660 1070).
Go into Multi-mode> Crop the image
If your desktop or laptop is not a gaming PC, you can use the RECentral smoothly because RECentral is designed for Gamer or professional video creator and requires the CPU and graphic card loading.