Is it possible to not add local previews from developers to the “Activity” tab for a stack? It makes perfect sense wanting to check your changes before making a PR, but less tracking it every time someone does (in my opinion it makes it harder to get to the important information).

Can you raise a request for this at https://github.com/pulumi/service-requests/issues/

Sure, added it here. https://github.com/pulumi/service-requests/issues/189