<wpml-config>
    <language-switcher-settings>
        <key name="display_ls_in_menu">1</key>
        <key name="icl_lang_sel_type">classic</key>
        <key name="icl_lso_flags">1</key>
        <key name="icl_lso_native_lang">1</key>
        <key name="icl_lso_display_lang">1</key>
    </language-switcher-settings>
</wpml-config>