I received a notification today (14th June 2023) that this was now solved. I was quite excited! By 'solved', I had imagined that the issue was solved, but apparently QB believes that their answer to my (and many others) OP has sufficiently solved the issue.

The issue of weekly reports defaulting to the American Sunday to Saturday still exists, so it has not really been SOLVED.

When British companies can get weekly reports Monday to Sunday, then it will have been solved.