Go to System Preferences > Users & Groups > Login Items for a list of apps set to launch on startup. To remove a specific app, highlight it and click the minus button under the list. If you prefer, certain apps can be set to launch at startup without necessarily popping up onto the screen.Jul 9, 2021
How to Stop Mac Apps From Launching at Startup | PCMag
https://www.pcmag.com/how-to/stop-mac-apps-from-launching-at-startup#:~:text=Go%20to%20System%20Preferences%20%3E%20Users,popping%20up%20onto%20the%20screen.
Have you tried this?
... View more