Hello Martin,

- With Tablet in portrait mode, the landscape oriented images aren't shown in full

I think this is a matter of current viewport. Check this article for more details

My fullscreen parallax image is not responsive and does not scale well

- With Tablet, long titles are not spaced correctly after the image: https://www.screencast.com/t/yIg7DRhxi

Corrected the problem on your site. Modified style.css and js/scripts.js

- Have the ability to have a title and a subitle for a portfolio

Give us more details plz. You have project information section

- have more thumbnail sizes for Portfolio (1/2 wide, 1/2 tall)

noted

- enable custom order for portofolio categories

https://en-ca.wordpress.org/plugins/taxonomy-terms-order/

-  Enable custom order of portfolios

you could use a plugin such as Post Types Order or you could backdate your portfolio posts

https://www.wpbeginner.com/beginners-guide/how-to-back-date-your-wordpress-posts/

- enable child theme possibility

attached

- option to disable NEXT and PREVIOUS link in portfolio view that jumps to the next porftolio

try adding

a.button-wrap.ajax-link-next-project, a.button-wrap.ajax-link-prev-project {
    display: none;
}

in customizer -> additional CSS

- possbility to DISABLE the featured image in a portfolio. Now it shows the featured image on the first position but I don't want that

you can remove lines 24-34 from single-andra_portfolio.php

<?php
// First image in the gallery is the featured iamge
$andra_full_image = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'full');
?>
                    <!-- Section Slide -->
                    <div class="swiper-slide">                        
                        <div class="img-mask">                            
                            <img src="<?php echo esc_url( $andra_full_image[0] );  ?>" alt="<?php esc_html_e("Gallery Image", "andra"); ?>">
                        </div>
                    </div>
                    <!--/Section Slide -->

- possibility to add videos to portfolio

noted

- enable night view as default view

it can be done with custom work

- disable or fade header when scrolling down

you can add the following in customizer -> additional CSS

header {
  position: static;
}

.filters-wrap {
  margin-top: 0px;
}

Yes, sorry

.icon-wrap {
    opacity: 0;
}

.button-text {
    display: none;
}

This will hide the prev next buttons and while keeping the image count.