The easiest thing to do is completely clear your history after each session so that PayPal is holding autologin credentials for a web browser whose cookies no longer exist. Or you can log into PayPal each and every time and disable it in Settings-->Security-->Auto login-->Update. If you don't clear your history, that setting might persist. Or you can check your email for the "turn off the Trusted Device status" link which is an excellent opportunity for phishing from anyone who knows you use PayPal. The third option is to wait for this asinine feature to eventually go away after whatever litigation or class action lawsuit eventually disabuses them of the notion that leaving access open to your account was a good idea. It basically boils down to we will only offer you account security if you let your cookies persist for all time so we can monetize tracking you. Otherwise we will leave your account wide open for abuse. Even accidental abuse is possible. I share a computer with my spouse. We both have different PayPal accounts but use the same Windows local account. It would be easy to accidentally purchase something using the wrong account.
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