Hello @sgchan,
Thanks for writing in.
You are using Ethos stack in Pro theme. Have you created a custom header for your site? Did you assigned your custom header as the global header? If that is the case, then the titles of the portfolio items will no longer display. Please keep in mind that the Portfolio Item titles were displayed in the landmark header which is part of the default header. As soon as you have assigned a new header, the landmark disappeared because it is now being replaced with the custom header. To resolve this, I would recommend that you duplicate your current header and add a new bar. This new bar will serve as the landmark header. You will have to insert a headline element in this new bar and utilize the headline’s dynamic content to display the title.

Or you can check out this thread instead:
And for the sidebar, assuming you have your child theme active and ready, please follow these steps below:
1] Using Notepad or TextEdit or Sublime Text or any text editor, please create a new file in your local machine.
2] Insert the following code into that new file
<?php
// =============================================================================
// VIEWS/ETHOS/WP-SINGLE-X-PORTFOLIO.PHP
// -----------------------------------------------------------------------------
// Single portfolio post output for Ethos.
// =============================================================================
get_header();
?>
<div class="x-container max width main">
<div class="offset cf">
<div class="<?php x_main_content_class(); ?>" role="main">
<?php while ( have_posts() ) : the_post(); ?>
<?php x_get_view( 'ethos', 'content', 'portfolio' ); ?>
<?php x_get_view( 'global', '_comments-template' ); ?>
<?php endwhile; ?>
</div>
<?php // this displays the sidebar ?>
<?php get_sidebar(); ?>
</div>
</div>
<?php get_footer(); ?>
3] Save the file named as content-portfolio.php
4] Upload this file to your server in the child theme’s folder wp-content/themes/x-child/framework/views/ethos/
5] If the sidebar still does not display, please add the following code in your child theme’s functions.php file
// Custom Portfolio Layout
// =============================================================================
if ( ! function_exists( 'x_get_content_layout' ) ) :
function x_get_content_layout() {
$content_layout = x_get_option( 'x_layout_content' );
if ( $content_layout != 'full-width' ) {
if ( is_home() ) {
$opt = x_get_option( 'x_blog_layout' );
$layout = ( $opt == 'sidebar' ) ? $content_layout : $opt;
} elseif ( is_singular( 'post' ) ) {
$meta = get_post_meta( get_the_ID(), '_x_post_layout', true );
$layout = ( $meta == 'on' ) ? 'full-width' : $content_layout;
} elseif ( x_is_portfolio_item() ) {
$layout = 'content-sidebar';
} elseif ( x_is_portfolio() ) {
$meta = get_post_meta( get_the_ID(), '_x_portfolio_layout', true );
$layout = ( $meta == 'sidebar' ) ? $content_layout : $meta;
} elseif ( is_page_template( 'template-layout-content-sidebar.php' ) ) {
$layout = 'content-sidebar';
} elseif ( is_page_template( 'template-layout-sidebar-content.php' ) ) {
$layout = 'sidebar-content';
} elseif ( is_page_template( 'template-layout-full-width.php' ) ) {
$layout = 'full-width';
} elseif ( is_archive() ) {
if ( x_is_shop() || x_is_product_category() || x_is_product_tag() ) {
$opt = x_get_option( 'x_woocommerce_shop_layout_content' );
$layout = ( $opt == 'sidebar' ) ? $content_layout : $opt;
} else {
$opt = x_get_option( 'x_archive_layout' );
$layout = ( $opt == 'sidebar' ) ? $content_layout : $opt;
}
} elseif ( x_is_product() ) {
$layout = 'full-width';
} elseif ( x_is_bbpress() ) {
$opt = x_get_option( 'x_bbpress_layout_content' );
$layout = ( $opt == 'sidebar' ) ? $content_layout : $opt;
} elseif ( x_is_buddypress() ) {
$opt = x_get_option( 'x_buddypress_layout_content' );
$layout = ( $opt == 'sidebar' ) ? $content_layout : $opt;
} elseif ( is_404() ) {
$layout = 'full-width';
} else {
$layout = $content_layout;
}
} else {
$layout = $content_layout;
}
return $layout;
}
endif;
// =============================================================================
We would love to know if this has worked for you. Thank you.