How do I increase the eraser size on Apple Pencil?

The native eraser tool can be set to erase objects, or pixels - the latter being a relatively small area. At present, the eraser tool in native Apps that support Apple Pencil and markup is otherwise not configurable.

Apple do invite submission of feature requests via their Product Feedback portal. For iPad and iPadOS:

Feedback - iPad - Apple

9Elysian Angels Said:

"How do you make second generation Apple Pencil eraser bigger“

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Enlarging Apple Pencil Eraser:

I’m not so certain you can, digitally. Try accessing something in Accessibility, seeing if you can make a change there.

Recommend this is Apple:

Do your Part: Recommend your ideas to Apple.  Apple may not get back you, but the more feedback they receive on this, the more they will know what their customers prefer, and what to consider in models to come.

1. Go Here: Feedback - iPad - Apple
2. Select: "Feature Request" for "Feedback Type"
3. Comment: on why you think this should be an option. Include the URL of this post
4. Proceed form there as necessary