I watched the service, Prince Andrew escorted his mother from the side entrance of the Abbey to the row where her seat was, and escorted her out the same way.
He didn’t walk the length of the Abbey as the other Royals, he didn’t meet, greet, shake hands with anyone. In fact it was all very discreet.
It’s the media who have blown him being there out of all proportion, he was at his fathers memorial service, other than coming in a disguise/full face mask what could he have done, other than not attend, with all the media storm that would also have created?