ich frage mich allerdings warum du es Dir so schwer machst die Layouts zu setzen.
Warum nicht in der 1/2 Column : heading ; image; text-block

EDIT to your next comment: I can’t entirely believe that, because it wasn’t old content that was presented, but rather there were several em tags as wrappers for existing content, as well as several empty em tags. There must have been at least one other reason.

also wenn ich mir in den DEV Tools diese Stelle ansehe, dann sehe ich schon em-tags:

da es ein Textblock element ist, müssen die schon aktiv gesetzt worden sein.

btw:

Das HTML-<em>-Tag (Emphasis) hebt Textteile semantisch hervor, indem es sie meist kursiv darstellt. Es signalisiert Browsern, Screenreadern und Suchmaschinen eine betontere Bedeutung, was die Zugänglichkeit und SEO verbessert. Es ist ein Inline-Element, das Wörter oder Phrasen betont, ohne einen neuen Absatz zu beginnen. 
Wichtige Fakten zum <em>-Tag:

    Semantische Bedeutung: <em> vermittelt, dass der Textteil wichtig ist oder betont werden soll, im Gegensatz zum <i>-Tag, das nur kursiv darstellt.
    Anwendung: Das <em>-Tag wird im Textfluss verwendet, z.B. <p>Dies ist <em>wirklich</em> wichtig.</p>.
    Darstellung: Standardmäßig wird der Inhalt vom Browser kursiv dargestellt.
    Barrierefreiheit: Screenreader nutzen das <em>-Tag, um den Text mit geänderter Betonung vorzulesen.
    Unterschied zu <strong>: <em> steht für eine sanfte Betonung, während <strong> für starke Wichtigkeit (meist fett) steht. 

It seems to be quite common with these services (iStock, Shutterstock, etc.) to register with a nickname rather than using your real name. Given the degree of overlap between the images from genious2000de and Francesco83, I would assume that they are the same person.

I would generally recommend hosting the fonts yourself. And even turning off Enfold support for Google Fonts.
It’s more flexible because you can choose the font styles you specifically need, and this is probably the only correct way to be GDPR compliant.
To hamper Google Fonts Support on Enfold – put this to your child-theme functions.php:

function my_output_google_webfonts_script( $activate ){
  return false;
}
add_filter( 'avf_output_google_webfonts_script', 'my_output_google_webfonts_script', 10, 1 );

For selfhosted Fonts – use the Enfold Font Manager – with its upload.
You upload zip files to that font-manager f.e.:

my recommendation is to use definitly woff2 fonts – but maybe as fallback the ttf Variants.
On zipping the Folder (Montserrat) – pay attention if you do that on Mac OSX. Because there are hidden files in there. You had to avoid that.

btw: , under German law, copyright is a highly personal asset. You cannot simply issue a warning to someone just because you see them stealing a third party’s image – even if you are a direct competitor.

Here is a breakdown of who is allowed to do what:
1. “Active legal standing” (who is allowed to sue?)
Only those whose own rights have been infringed may demand cessation. In copyright law, these are:

• The author themselves: The creator of the work.
• The exclusive rights holder: For example, a publisher or agency to whom the sole rights have been transferred. (Shutterstock, iStock etc.)
• Authorized representatives: A lawyer or an association (e.g., GEMA), but these act on behalf of and with the authority of the author.

Therefore, ask whether COPYTRACK (and the internet is full of complaints about them) has the right to issue warnings on behalf of the author.

where do you want to use it? as standalone text. or inside a text-block?

you can style a button this way (i used x-large button for that) – and even the padding you can have on button element itself – including border-width and border-radius.
Only css is needed if you like to have a min-width for that button.

https://webers-testseite.de/bemo-button/

on the right – that is your screenshot image.

there is one problem with your links on that masonry – the titles are often the same as the file-names
your alt attribute is always the same for that gallery: 7106 Bluff Run

Next : on the element itself – where you set the option to show lightbox images. – there is underneath a dropdown with an option what to show as bottom-bar text:

But if you have forgotton to show this on multiple masonry galleries – then you can place a little snippet instead in your child-theme functions.php:

function masonry_title_fix(){
?>
<script>
(function($){
    $(window).load(function() {
        $('.av-masonry .lightbox-added').each(function(){
            var lin = $(this).attr('alt');  /* === or choose title here === */
            $(this).attr('title',lin);
        });
    });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'masonry_title_fix');

because you have the masonry perfect grid – you have no imgs inside but you can change it for the anchor tag.

but btw. why don’t you use the video element and set your image as preview /fallback image on that element?
On advanced privacy settings (on the video element itsself) you can choose to show the video in the lightbox.

can you try this:
place that snippet inside your child-theme functions.php:

function lightbox_with_mixed_content_type() { 
?>
<script type="text/javascript">
window.addEventListener("DOMContentLoaded", function () { 
  (function($){
    $('.mixed-contenttype a').each(function(){
      var anchorLink = $(this).attr('href');
      if (/\.(jpg|png|gif|webp|jpeg)$/.test(anchorLink)) {
        //console.log(anchorLink + " is an image link");
      } else {
        $(this).attr('rel', 'lightbox').addClass('mfp-iframe');
      }
    }); 
  })(jQuery);
});
</script>
<?php 
}
add_action('wp_footer', 'lightbox_with_mixed_content_type', 999);

on your page place a button and give that custom class to the elment (or to one parent element) : mixed-contenttype
now link to your pdf.
See: https://webers-testseite.de/pdf-in-lightbox/
But: Not all browsers will display this, especially mobile browser variants.

INFO: due to GDPR ( DSGVO in Germany ) i can not show the working script for video content – it is hard to block this – playing videos from a masonry or from an image linked to a video.

yes – enter your red logo to the enfold logo input field.

on media library determine the path to your : ETH_galabau_Logo
guess it looks like this one :

insert that url to the is_tree(265) url:

place this snippet to your child-theme functions.php:

function is_tree($pid) {
    global $post;
    if ( is_page() ) {
        if ( is_page($pid) ) {
            return true;
        }
        $ancestors = get_post_ancestors($post->ID);
        if ( in_array($pid, $ancestors) ) {
            return true;
        }
    }
    return false;
}

function av_change_logo($logo){
        if (is_tree(265)) { $logo = "/wp-content/uploads/…/…/your_green_galabau_Logo.png";} 
return $logo;
}
add_filter('avf_logo','av_change_logo');

the first function (function is_tree($pid) ) is for having all subpages to your galabau page (which has the id: 265.
from this moment – you do not need to add a new page-id to your page_array. If a page is a child of that 265 it will have that green logo.

is it a horizontal scrolling page? thats extraordinary.
Nearly all enfold demos could have even that rule:

html.responsive, .responsive body {
    overflow-x: hidden !important;
}

the scroll in y-direction should work as expected.

There is no way around side positioning. The large image will always take up so much space that you will always find scenarios where you can only see very little of the thumbnails scrolling underneath.
iPad landscape etc.

7.1.4 is downloadable now

by the way – i guess 7.1.4 is online !

my values are A+ and 120/100. ;) yes that is possible with extra points on mdn observatory

for wordpress pages with all its plugins you can not have better settings on style-src than ‘unsafe-inline’

No – i’m participant as you are.
Das sind in solchen Fällen häufig die Stolpersteine. Da musst du auf einen Mod warten, eventuell hast du eine Anweisung in deiner child-theme functions.php die es auf 3 Einträge beschränkt; dafür muss sich aber jemand mit Sachkenntnis denke ich bei dir einloggen und nachschauen.
Schau doch mal ob WP-Rocket der Verursacher ist und nur 3 Beiträge im Cache hat.
Mal den Cache im Plugin löschen und eventuell mal kurz deaktivieren. Dann Enfold veranlassen die css und scripte neu anzulegen.