maybe you style it this way: one color-section to 100% height. Page Template as : Template Blank – no header no footer

see: https://enfold.webers-webdesign.de/website-switch/

you can have that page as landing page – but for your menu set the home button as you like and change logo link to Website A link

add_filter('avf_logo_link','av_change_logo_link');
function av_change_logo_link($link){
    $link = "https://website-A-Domain-link";
    return $link;
}

do not use these filters for that – just load your svg logo by enfold options dialog.
All newer Enfold will suport the inline svg logo now. And on transparency the same

See comment on bottom right “Since 4.8.6.4 … )

These filters can be used to show on specific pages a different logo. But for svg there might be better ways then.

f.e.: to replace a standard jpg/png logo with inline svg on specific pages:

function replace_logo_with_svg() {
if(is_page(array( 39718, 39906))){ 	
?>
  <script type="text/javascript">
  (function($) {
    function a() {
      $( ".logo a img" ).remove();
      $.get('/wp-content/uploads/logo-rood-2023.svg', function(svg){
        $( ".logo a" ).html( svg );
      }, 'text');
    }
    a();
  })(jQuery);
  </script>
<?php
}
}
add_action('wp_footer', 'replace_logo_with_svg');

see here a different logo – than on the other pages: https://webers-testseite.de/portfolio/

are you trying to have a menu floating into two lines? – Or do you only want to have a break in menu label ( see here: https://consulting.webers-testseite.de/ )

the first is possible too – with flex box layout. But that will be difficult to style if you have a shrinking header – and if the first level menu-items got a lot of drop-down sublevel menu-items ( or mega-menu option ) see: https://pureinstall.webers-testseite.de/impressum/
You will run into conflict with area to click – The click areas are too close together
see docu: https://kriesi.at/documentation/enfold/menu/#multiline-menu
( but that will work with menu left and logo right too – just change some flex settings to have it )

under Performance Setting you find it on the top : “File Compression” – you can set css and js merging.
This setting ensures that a single file ( each ) is created from the many individual css or js files; this is then loaded by Enfold instead of the individual files. But this is a kind of cached information. Therefore, changes to the settings are only visible when you reinitiate the creation of these merged files below.

Hence my request to switch off this setting to find out where the changes were made.
In principle, I would also recommend to turn this on or install caching tools/plugins only after you are finished with the layout of your page.

if you sitch off your merging we can better inspect your site – but there is a rule inside your css:

#top #header .av-main-nav>li>a {
 font-size:14px
}

and i think that this comes from advanced styling. And this is not your intention ?
how did you load the cormorant garamond font?

sorry – no private content area for me – i’m participant as you are.

Then we have to know more details – is Enfold Up to Date. What about WordPress Version.
Or just post a link to your page – if not possible on public – use the private content area for the mods.

Please pull your svg logo to a browser window – to see if it is rendered by a browser.

Dear Vanessa – if you look at all my other postings (now over 9300) you will see that it is rather the other way around. I often tend to provide long answers with as accurate as possible mostly even illustrated postings. With such small quick css settings I didn’t think it was necessary to have a longer conversation.
And abbreviations like btw and afaik and more should have made their way into the Internet culture by now.

Unfortunately, I have had the experience that most participants do not read the long answers. Descriptions are not read, that one should set e.g. a user-defined class not heeded or case distinction overread.

e.g.
https://kriesi.at/support/topic/host-web-font-yourself-some-info/#post-1364066

wow

#top .mfp-title {
  font-size: 24px;
  font-family: …
}

btw. for the counter:
#top .mfp-counter

btw: to set a different source image for the newsbox / portfoliobox you can add that snippet to child-theme functions.php:
( you have to look what index your widgets get )

function my_avf_newsbox_image_size( $image_size, array $args, array $instance ){
  if( $args['widget_id'] == ( 'portfoliobox-3' || 'newsbox-2' || 'newsbox-4' ) ){
    $image_size = 'square';
  }
  return $image_size;
}
add_filter( 'avf_newsbox_image_size', 'my_avf_newsbox_image_size', 10, 3 );

now for the example above you can now enlarge the thumbnail via quick css:

.news-thumb,
.news-thumb img {
  width: 100px;
  height: 100px;
}

see: https://enfold.webers-webdesign.de/impressum/ at the footer widgets

everything is right – little hint – place a video alb element outside of that with the link to your youtube video. On Content – you can click “Download Video Thumbnail” – this image will be saved in the media library.
After that – you can get rid of that “helper” video alb element – but now you can insert this thumbnail inside the toggle content.

Use Duplicator Plugin. Even the free Version is powerful enough to migrate that webseite. After installation you can Revalidate or remove the token, and insert a different one.

Maybe off topic – but you mentioned above the RestApi
which in my opinion is a security risk anyway.
With it you can e.g. read all usernames. Which is half of a bruteforce attack.
Insert to your Browser :

https://your-domain-url/wp-json/wp/v2/users

and replace “your-domain-url” for your domain

so many people disable this RestApi completely – or like me only for logged out users and only the security relevant things
this goes into the child theme functions.php

/**
 * REST-API Filter entfernt wichtige Informationen fuer den Zugriff von Aussen
 * @link https://developer.wordpress.org/rest-api/reference/ REST-API Referenz
 */
add_filter('rest_endpoints', function ($endpoints) {  
	if ( ! is_user_logged_in() ) {
		$endpoints_to_remove = array(
		'users',	/* removes the users from the data */
		'settings',	/* removes the website settings from the data */
		'posts',	/* removes the post content from the data */
		'pages',	/* removes the page content from the data */  
		);
		foreach ($endpoints_to_remove as $endpoint) {
			$base_endpoint = "/wp/v2/{$endpoint}";
			foreach ($endpoints as $maybe_endpoint => $object) {
				if (strpos($maybe_endpoint, $base_endpoint) !== false) {
					unset($endpoints[$maybe_endpoint]);
				}
			}
		}
		return $endpoints;
	}    
});

Header – Extra Elements – Header Secondary Menu

I’m not sure if the colored settings will preserve there – but you can style them manually via quick css