How do I completely turn off password pop-ups across my Macbook Air (running Ventura, fully updated)

Go to the System/Passwords settings and and click on Password Oprtions:

Then make sure both of these slide switches are turned OFF.

That means you don't have iCloud syncing enabled. So turn off that one slide switch.

Try toggling the switch on and off a couple of times. Then reboot.

Here's some food for thought: unless you're using a true VPN tunnel, such as between you and your employer's, school's or bank's servers, they provide false security from a privacy standpoint.  Read these two articles: Public VPN's are anything but private and Former Malware Distributor Kape Technologies Now Owns a Number of Public VPNs and a Collection of VPN “Review” Websites.  



Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?