The ‘Remember Me’ option is a checkbox on the WordPress login screen that lets your users save their username and password. If checked, WordPress will remember the login session for 14 days.

If you want to disable the Remember Me option in WordPress, here is how to do it:
1. Hide the option using CSS
This method will simply hide the checkbox from the user, add the following to the Customizer > Custom CSS section:
p.forgetmenot {
display:none!important;
}
the result:

2. Hide the option using Remember Me Controls plugin
Upon activation, navigate to Settings » Remember Me and check the box that says Disable the “Remember Me” feature

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