This is Ren from the Shopify support team, here to help you out.
While there isn't a way to widen the variant section in that particular spot, what you can do is select all of the variants you're working with and once the boxes and checked, you'll notice a Bulk Editor button:
Clicking this button will take you to a full screen editing page where you won't be required to do as much scrolling right:
The exception to this is if you start adding more field to edit, which in this case you can simply remove ones you aren't currently working on to avoid having to scroll. Let me know if I can clarify any of that for you!
Ren | Social team @ Shopify
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