what is your code you inserted to copy right input filed?

Did you pay attention of the jQuery Migrate Plugin settings: load 1.12.4 legacy jQuery

but you can do something that will not disturb those menu-item-ids.
You can give an Id and Alt attribute to the anchor itself.

But i had to find a way that we will not have duplicate ids then – you see the problem if you put this to your child-theme functions.php

the (hamburger menu items anchors will have the same ids – and if the menu-link goes in a one-pager to that ID – . . . . .… etc. pp.
maybe it is on SEO Purpose more important to have only the alt Attribute to that link!!!:
Why must it be an ID that was tracked by Google Analytics? Arn’t there other possibilities.

function set_attributes_to_menu_links(){
?>
<script>
(function($){
  $(document).ready(function(){  
    $('#avia-menu .menu-item a').each(function(){
      var menuName = $(this).find('>.avia-menu-text').text();
      var customID = menuName.replace(/\s+/g, '_').toLowerCase();
      $(this).attr('alt', menuName); 
      $(this).attr('id', customID);    
    });
  });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'set_attributes_to_menu_links');

just look to a enfold layout with developer tools of your browser- you can use that html as well:

<div class="flex_column av_one_half first">
	<label>[text* your-name  placeholder "Your first and last name * "] </label> 
</div>
<div class="flex_column av_one_half">
	<label> [email* your-email placeholder "your E-mail address *"] </label>
</div>

<div class="flex_column av_one_full"> <label>[text* your-subject  placeholder "Your Subject *"] </label> </div>

Here on that example it is with placeholder text for the input fields. But this is not necessary.
Just place the given content of contact form 7 inbetween these divs

maybe you style your layout on a post first with only columns in advanced layout builder and look to this post on your browser with dev tools
f.e. this is the needed code for 1/3 – 2/3

<div class="flex_column av_one_third first">
   content from contact form 7
</div>
<div class="flex_column av_two_third">
     content from contact form 7
</div>

and you are shure that you are not affected by this: https://kriesi.at/support/topic/problems-after-updating-to-wordpress-5-6-read-this-first/

to have the shortcode option on polylang first add this to your child-theme functions.php:

function polylang_shortcode($atts, $content = null){
	if (empty($content))
	return '';
	extract( shortcode_atts( array('lang' => ''), $atts ) );
	if (empty($lang))
	return "<h3>You must specify 'lang' using shortcode: polylang</h3>";
	return ($lang == pll_current_language()) ? $content : '';
}
add_shortcode('polylang', 'polylang_shortcode');

after that you can insert this :
[polylang lang="en"]english content[/polylang][polylang lang="de"]deutscher Inhalt[/polylang][polylang lang="nl"]Nederlandse inhoud[/polylang]

on your link on top there is another interesting snippet – it will insert the oportunity to choose the orderby option on each alb.
https://kriesi.at/documentation/enfold/post-slider/#how-to-add-an-orderorderby-option-to-the-blogpost-sliderportfoliomasonry-grid-element
then take two blog posts for the newest posts of “Einsätze” and “Neuigkeiten” and for the last one only the randomized one a post slider?
the two show as grid with one column.

On the postslider you can choose the offset not to show duplicate post on the page.
Randomize only that slider

https://webers-testseite.de/jakob/

PS : mit dem Snippet oben, könnt ihr dann natürlich auch drei post-slider nehmen.
die zusätzlichen Optionen sind unten platziert:

• This reply was modified 5 years, 1 month ago by Guenni007.

mediaelement-and-player.min.js is part of WordPress – so i guess on one of the last updates ( and as i said i did not update to WP5.6) there must be a sourcecode difference to older WP Versions.

these are my two sites ( backgroud-video on slider and on color-section) :
https://webers-testseite.de/mute-unmute-video-slide/
https://webers-testseite.de/mute-unmute/

And you are right – that on safari this did not work – with exactly your error log. i tested this on former times on safari too and it worked. So something must have changed in the source code either Enfolds, WordPress or Safari. These Sites above are from 2019-02-13 and color-section site from : 2018-05-01.
By the way: the domain above is still on WP 5.5.3

If not today when then one should do something good to a Ludwig.
* Ludwig v. Beethoven baptized on 17.12.1770

best whishes from Bonn to the rest of the world ;)

is this an actual Enfold Version?
this is not the actual Version fo TinyMCE !

by the way : how did you insert images here on board – i only see on source-code your links to your posted images.
My images you can see above on the answers.

ok – you got a slideshow – selector is a bit in dependency what kind of Caption you use ( framed etc)

if you only like to have it not vertically centered then Rikards code is to use.
If you want to influence the distance between : avia-caption-title and avia-caption-content
you can use:

.postid-3540  .slideshow_align_caption .avia-caption-title {
    margin-bottom: 20px !important;
}

but the code ( if your postid is correct ) had to work too:
here a testpage with only #top h2

maybe you have activated the option : force inline-svg that will transform all : <img src="image-source.svg" /> to svg itself
then svgs as inline svg needs absolute dimension settings – otherwise they will have 0x0px dimension :

img[src*=".svg"], svg {
    width: 2500px;
    display: block;
}

the front-end width is then done by surrounding container.

i guess you had to help her – she ( or he – could be both with that nick) – only 2 postings on her history. Maybe that is hard stuff for a beginner

Sorry then you have to wait for Nikko or any other Mod – i’m participant as you are. So i do not see private content area.

the other hint is to put the code to your quick css: