DES MOINES, Iowa — President Trump’s mass rallies are out, and Vice President Mike Pence is forgoing the meatloaf lunches in homely diners.

But this week brought a taste of how the Trump campaign is adjusting to the realities of COVID-19, with a split-screen presentation showing a president at work in the Oval Office on Middle East peace and a vice president trying to shore up support among anxious farmers in a key swing state.