Quiz

There is not currently an option to disabled particular quiz access rule plugins. (There should be - for consistency with other plugin types.)

Using one of the standard tricks to inject CSS (https://docs.moodle.org/38/en/Themes_FAQ#Where_shall_I_put_my_custom_CSS_code.3F) try adding

#page-mod-quiz-mod #id_browsersecurity option[value="securewindow"] {
display: none;
}