Hi there @Coverage
The Preview option is connected to the public beta/early-access experience, which may show a permissions prompt based on your user access. You don’t need to approve that prompt for the automatic August 31 change. If you’re not comfortable proceeding, you can close it and ask your account Super Admin to review what’s being requested.
HubSpot communicated this through the in-app Product Updates experience and an in-product banner. An email was also sent in June to eligible Super Admins for portals still using the classic theme, so not every user would necessarily have received it. You can review the new theme Product Update and the community overview for more details.
I hope this helps!
Cassie, Community Manager