More than 1 million Illinoisans have applied to vote by mail for the November election, roughly triple the number of the last presidential contest in 2016. The record number during the pandemic has left election officials scrambling to adjust and some voters worried about the process. Meanwhile, a partisan battle over the practice is unfolding in the courts weeks before the first ballots go out. Here’s a closer look: Preparing for November Election officials are making adjustments to address the volume. The first mail …