Also – du willst den Header schon oben habe, aber das Menü links – wo soll das Logo dann sein?
Du findest verschiedene Header Stylings bei Enfold (Child) – Header – Header Layout : “Menu And Logo Position”

on one page there is – as you said pt-sans on the other there is open-sans for headings.
i do not see that you have uploaded there the pt-sans ( St. Martins Ring)

Take a color-section – give a custom-class to it – f.e.: responsive-background
( no minimum height option ! )

Place your image as background-image to this color-section – and set it to cover the background.
Now : look for the aspect ratio of that background image ( on my testpage it is 1500:686 = 100:45,73 )

now place to your quick css :

.avia-section.responsive-background {
  height: 45.73vw;
  min-height: 0;
}

see: https://enfold.webers-webdesign.de/responsive-background-image/
If you have a boxed layout – we need to set a max-height for that color-section

or try that new filter in your child-theme functions.php:

add_filter( 'avf_default_lightbox_no_scroll', '__return_true' );

might break ALB backend or frontend

( Conditional II )

did you test if it breaks the frontend?

PS: coming back to your initial Question insert only for pages/post that have transparency headers…

i do not know if there is a conditional for that action hook that could be used to avoid the insertion.
But on html there is a class : html_header_transparency and html_header_glassy for those pages – so you can insert that banner on all pages and set the display to none if these classes are not there!
f.e.:

html:not(.html_header_transparency) #banner {
	display: none
}

Sorry – now I have changed my layout to Boxed – this makes no difference on my test platform, except for large screen widths larger than 1600px the image is further enlarged and cropped. To avoid this on your installation, please switch back to your boxed layout and we will find a way.
i see on boxed layout there is a little different html for those sections – but we can leave out the empty content of this color-section anyway:
(it is only important that we have inside the div with container class)

add_action('ava_after_main_title', function() {
?>
<div id="banner" class="avia-section main_color avia-section-default avia-no-border-styling avia-builder-el-0  avia-builder-el-first av-small-hide av-mini-hide avia-full-stretch avia-bg-style-scroll container_wrap sidebar_right" data-section-bg-repeat="stretch">
  <div class="container av-section-cont-open"></div>
</div>
<?php
});

In a boxed layout we can prevent the enlargement by giving the #banner a maximum height – since body is set to 90% width – this must be included in the calculation.

@media only screen and (min-width: 990px) {
  #banner {
    max-height: calc(0.9 * 556px);
    height: calc(0.9 * 34.75vw);
    background-repeat: no-repeat;
    background-image: url(/wp-content/uploads/2022/10/logo2-1.jpg);
    background-position: 0% 0%;
    background-attachment: scroll;
  }
}

/****  beneath the 990px boxed layout body goes to 100% width ******/
@media only screen and (max-width: 989px) {
  #banner {
    max-height:556px;
    height: 34.75vw;
    background-repeat: no-repeat;
    background-image: url(/wp-content/uploads/2022/10/logo2-1.jpg);
    background-position: 0% 0%;
    background-attachment: scroll;
  }
}

It took me a long time to get it right. On the basis of my postings here you can see that in principle I like to share my knowledge, but here I would like to keep that as a unique selling point for me and my Customers. Sorry.
Unfortunately, even from the really good support team of Borlabs there is no more help. A thought I sent to the team there was still taken over, but further help was not granted – only with the hint that the Enfold Dev Team would have to take care of it. I think that is really the wrong addressing.

However, I would like to point out that iframes are always blocked correctly by Borlabs, if they are correctly enclosed by the Borlabs code. So Youtube Iframe Code in a codeblock element will work!

[borlabs-cookie id="youtube" type="content-blocker"]<iframe width="720" height="405" src="https://www.youtube-nocookie.com/embed/G0k3kHtyoqc" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>[/borlabs-cookie]

i found your page try please :

add_action('ava_after_main_title', function() {
?>
<div id="full_slider_1" class="avia-fullwidth-slider main_color avia-shadow av-small-hide av-mini-hide  avia-builder-el-0  el_before_av_textblock  avia-builder-el-first   container_wrap sidebar_right"><div class="avia-slideshow av-l8ypj1ln-1436a823a5edef515622515055099065 avia-slideshow-no scaling av_slideshow_full avia-slide-slider av-small-hide av-mini-hide av-slideshow-ui av-control-default av-slideshow-manual av-loop-once av-loop-manual-endless image_no_stretch avia-slideshow-1" data-slideshow-options="{&quot;animation&quot;:&quot;slide&quot;,&quot;autoplay&quot;:false,&quot;loop_autoplay&quot;:&quot;once&quot;,&quot;interval&quot;:5,&quot;loop_manual&quot;:&quot;manual-endless&quot;,&quot;autoplay_stopper&quot;:false,&quot;noNavigation&quot;:false,&quot;bg_slider&quot;:false,&quot;keep_padding&quot;:false,&quot;hoverpause&quot;:false,&quot;show_slide_delay&quot;:0}" itemprop="image" itemscope="itemscope" itemtype="https://schema.org/ImageObject"><ul class="avia-slideshow-inner " style="padding: 0px; height: 486px;"><li class="avia-slideshow-slide av-l8ypj1ln-1436a823a5edef515622515055099065__0 av-single-slide slide-1 slide-odd next-active-slide active-slide" style="visibility: visible; opacity: 1; transition: none 0s ease 0s; transform: translateZ(0px);"><div data-rel="slideshow-1" class="avia-slide-wrap "><img class="wp-image-2841 avia-img-lazy-loading-not-2841" src="https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1.jpg" title="logo2" alt="" itemprop="thumbnailUrl" srcset="https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1.jpg 1600w, https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1-300x104.jpg 300w, https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1-1030x358.jpg 1030w, https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1-768x267.jpg 768w, https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1-1536x534.jpg 1536w, https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1-1500x521.jpg 1500w, https://jaro.jamesdk.sk/wp-content/uploads/2022/10/logo2-1-705x245.jpg 705w" sizes="(max-width: 1600px) 100vw, 1600px" style="left: 0px;" width="1600" height="556"></div></li></ul></div></div>
<?php
});

the shortcode will start too at this highest slider div – so you had to copy all that

you can even take the whole slider with all settings made by enfold.
Sometimes these settings are made with classes on parent containers. So you had to find the correct container for html copy.
For images enfold starts with a div.avia-image-container – try to copy that whole outer-html

i tried to insert on header.php an own custom hook – but with no effort on doing that. Because to keep a child theme header.php would not be a problem either. The original position of the slide is just after the opening #main tag.

But what you can try is to insert not the shortcode with that hook – but to insert html.
Just style a page where it is like you wanted to have the slider on top. Inspect that page with developer tools of your browser and copy whole html code of it. Insert it via:

add_action('ava_after_main_title', function() {
?>
here is the place for the whole html code
<?php
});