Dropdown does not work on my end

Hello I am trying to show language switcher in header via this function:

add_action( 'et_header_top', 'add_my_account' );
function add_my_account(){
echo '<ul>';
pll_the_languages( array( 'dropdown' => 1, 'show_flags' => 1,'show_names' => 0 ) );
echo '</ul>';
}

but dropdown is not working. here is screen: https://ctrlv.cz/2xfD

Next to it, there is language switcher placed in primary menu, but i want to have it outside from menu. Its only for testing purposes there

Thanks for any idea how to fix it

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