The modern msconfig (now called System Configuration) no longer manages startup items. Instead, it offers a "Boot" tab where you can set advanced options like Safe Mode, number of processors, and maximum memory. It's for troubleshooting boot-time system issues, not everyday startup management.
Configure Startup applications in Windows - Microsoft Support autostart program windows
That’s it! The next time you restart your PC, that program will boot right up with you. The modern msconfig (now called System Configuration) no