checked()
only checks if the passed first and second parameters match. It doesn’t do any array key checking, so you need to do it yourself before using the function to avoid errors.
<?php
global $options;
$enabled = ( isset( $options['enable'] ) ) ? $options['enable']: '';
?>
<input name="settings['enable']" type="checkbox" id="" value="1" <?php checked( $enabled, 1 ); ?>>
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