Kate Middleton and Prince William seem to appear more relaxed as they step out for public engagements after Prince Harry and Meghan Markle left, according to a royal biographer.

Angela Levin said in an interview on talkRadio that the Duke and Duchess of Cambridge seem to have changed and look "very, very easy" with each other during their last joint royal engagement. Kate was even seen swaying to the music at one stop as she and Prince William embarked on a three-day, 1,250-mile Royal Train Tour across England, Scotland, and Wales.

The Cambridges also managed to show some tender moments in public. Levin said that it was easy to see that they are "very much like a team." Levin also explained that this is likely because they are no longer "under attack," alluding to the rift between William and Harry.

Body language expert Judi James also agreed that William and Kate gave off such a relaxing vibe during their Royal Train Tour. They were also more "openly affectionate" towards each other, giving the public an authentic glimpse into their relationship as a couple.

Photographs showed William and Kate placing their hands on each other's back as they walked and met people, amid socially-distanced protocols. James said that the signs of affection the Cambridge couple gave each other were spontaneous whereas, in the past, William and Kate avoided any public displays of affection (PDA).

James also added that even with face masks on, it was easy to spot Kate and William's strong emotional connection in their eyes. William's eye muscles were particularly soft when he's looking at his wife, while Kate keeps looking up at him, tilting her head and raising her chin to convey a sign of trust.

But, the Cambridges face criticisms from some officials who think that this tour was unnecessary, especially when most people in the U.K. are told to stay or work from home in this pandemic. Wales' health minister Vaughan Gething and Scotland's first minister Nicola Sturgeon openly expressed their objection to the Royal Train Tour.

Kensington Palace aides, however, didn't comment on the statements of Gething and Sturgeon but instead said that their office coordinated with both governments in planning the tour. Kate and William were also technically "working while traveling," thus making their trip legal despite the pandemic restrictions.

At the start of the Royal Train Tour, officials at Downing Street declined to comment. When the tour concluded, Prime Minister Boris Johnson released a statement to say that this was a valuable effort to boost the morale of the frontliners.