Is it just me or does the Rover app refuse to rotate?

Yup portrait mode is the only way the App works. I'd contact support and ask them to submit a programming change, but alas it's probably a waste of time as Rover rarely implements any sitter requested changes, [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team]