All Settings Link Under Settings

Adds "All Settings" to the Settings menu, which opens the hidden screen listing every stored option for administrators.

Code

add_action( 'admin_menu', function () {
    add_options_page( 'All Settings', 'All Settings', 'manage_options', 'options.php' );
}, 99 );

Saving that screen writes every option at once; change values there with care.

Install WPIDE on your WordPress site (it is free) and open Code Snippets.
Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
It is added inactive: review the code and settings, then switch it on.