Landing page in PowerBI

Power BI doesn’t support page-level security. Once someone has access to a report, they can see all of its pages.

That’s why the “dedicated landing page” idea is usually just for navigation, not for restricting access. Say if you need Person A to see only the PDS page and nothing else, you’ll need to create a separate report (just containing that page) and share that with them.

I'd still suggest using Power BI Apps with audiences (if available). Publish your reports into an App, and use App audiences to control who sees which report. That way Person A only sees the PDS-only report.