Q:

Formal for "move the focus from A to B"?

What is a formal way of saying "move the focus from A to B" in the following context?

The two curves swap their locations when we move our focus from measure A to measure
  B.

My some lousy solutions are

The two curves swap their locations when we switch from measure A to measure B.
The two curves swap their locations when we focus on measure A instead of measure B.

A:

The two curves transpose when we shift focus from A to B.

