Fitts's Law

If

The time to move to a target depends on its distance and size: distant, small targets are slow and error-prone; near, large targets are fast. Pointing is a physical act with a measurable cost.

Then

“Make frequent or destructive actions big and easy to hit; make rare or dangerous ones small and far. Screen edges and corners are effectively infinite targets — put primary actions there.”

Unless

Edges & Corners / Sizing by Frequency