Multiple new line formatting

I don’t understand your question. What exactly would you like to get changed?
Is it the Element Preview field you don’t like to have?
Dashboard – Enfold (Child) – Layout Builder and check: “Disable advance layout builder preview in backend”

Edit : now i see the movie – it took some time for the movie to start.

I don’t think you’re doing yourself a favor with a bump. This gives your theme a new timestamp and is therefore more recent. The mods I think work it off chronologically.
Besides, it’s not an enfold problem. The wpautop function is WordPress own and the TinyMCE is a bit hard to be influenced there.
I have already tried tinymce.init, but have not yet had any success.
It’s up to you to use a <br class="noclear"> in the html editor field several times instead of <br>.

the thing is the multiple br use.
If you use in Visual Mode the shift and the return – you wil have one <br>
If you use the Return without shift it wil end in a p-tag.

these are the lines in formatting.php (WordPress File) to be responsible for multiple br replacement:
line 476ff

// Change multiple <br>s into two line breaks, which will turn into paragraphs.
	$pee = preg_replace('|<br\s*/?>\s*<br\s*/?>|', "\n\n", $pee);

what makes me wonder is that the old filter in functions.php child-theme:

remove_filter( 'the_content', 'wpautop' );
remove_filter( 'the_excerpt', 'wpautop' );

seems not to work as it should.

Even the filter tiny_mce_before_init i try to influence it via that filter

add_filter( 'tiny_mce_before_init', 'change_mce_options' );
function change_mce_options( $init ) {
	$init['extended_valid_elements'] = '*[*]';
	$init['remove_linebreaks'] = false; 
        $init['convert_newlines_to_brs'] = true; 
	$init['remove_redundant_brs'] = false;
	return $init;
}

no effect

the edited textblock.php ALB Element with no wpautop stripslash : https://pastebin.com/M91L76av
_________________
A multiple <br> will always be tranformed to one p-tag

Video
;)