Scientific anti-realism is the view that science does not claim objects like electrons actually exist. They are just a fictional construct to explain how things work. This view fits best with which truth theory:

This view fits best with "THE PRAGMATIC THEORY OF TRUTH".

Explanation: The pragmatic theory of truth states that something or a statement can be true, if only it have been tested and practice to be true. It means that truth can only be verified by experimenting ones belief or concept.

For science to use electron which is believed doesn't physically exist to explain concept that physically exist, that means the truth of the existence of an electron has has been tested and has gone through practicals, which shows that electron exist. The pragmatic theory of truth proves the existence of an electron to be true because it has been proven and tested to be true, using some physical principle, even though it has not been physically seen. Many scientific theories uses pragmatic theory of truth, to stand it's statement to be truth.