i found the solution. Sorry for the trouble.
just added this in my function.php in child theme
remove_action( ‘woocommerce_register_form’, ‘dokan_seller_reg_form_fields’ );
@xeith, you answer is wrong. because ‘dokan_seller_reg_form_fields’ is added inside a class. so remove_action wont work as you mentioned. so working solution is below.
Note: this is tested with DokanPro 2.7.4
function remove_dokan_frontend_vendor_registration() {
$Dokan_Pro = dokan_pro();
remove_action( 'woocommerce_after_my_account', array( $Dokan_Pro, 'dokan_account_migration_button' ));
}
add_action( 'init', 'remove_dokan_frontend_vendor_registration' );