The whole thing wouldn’t be so bad if the first value in the ALB element didn’t override the default values of the Enfold options under Advanced Options: Customize Typography Settings.
So if values are changed in the ALB, only the values for the corresponding screen width should be changed – and no new default value should be set.

Yes – i can confirm this for headings
on that test page i choose under styling tab : 48px and for the next ( 768-989) 40px and let the rest to default.

So – I can confirm that. Strangely enough, it is also there as it is.

The first setting defines the “Default Size”. I think this is not how it should be interpreted. The format should be set there for large screens.
Or one takes it in fact here around the default to specify, it can be overwritten then in the following with another setting and if one leaves it on “default” with the smaller screen widths it is defined there relative (thus 480px to 767px) on 50% then the smaller screens accordingly smaller.

https://webers-testseite.de/responsive-font-behavior/

i do not see any tab-section on that page – the ID has changed too. So can you correct the link to that element it is concerning too – or make a screenshow what you like to change.

there is that one snippet for child-theme functions.php :
( it turns from inline css to internal css )

function custom_avf_post_css_create_file( $create ){
	return false;
}
add_filter( 'avf_post_css_create_file', 'custom_avf_post_css_create_file', 10, 1 );

After that the inline css will be not there ( it changes to Internal CSS ) – and the styles are placed before the container as <style …>…</style> which is then included to merged styles.

You can of course edit all loop files that are affected and upload them as child-theme files.
Unfortunately, this is quite a lot of places to change, due to the fact that we have different cases here.
(Business-, Elegant-, Business-modern Blog) and that in loop-index.php, loop-portfolio-single.php etc.

but you can try this substitution via gettext:

function my_text_strings( $translated_text, $text, $domain ){
switch ( $translated_text ){
    case 'Read more'    :  $translated_text = __( 'Read more of it', $domain ); break;
     // in case you got different languages on your page and want to change them too:
    case 'Weiterlesen'  :  $translated_text = __( 'Mehr über das Thema …', $domain ); break;
  }
  return $translated_text;
}
add_filter('gettext', 'my_text_strings', 20, 3);

in loop-index.php you have that filter : avf_show_author_meta search for it – one of the next lines is:

$meta_author  = '<span class="blog-author minor-meta">' . __( 'by', 'avia_framework' ) . ' ';

there is the linking word : by
so my advice is to have a child-theme loop-index.php
edit that line to :

$meta_author  = '<span class="blog-author minor-meta">';

and create a child-theme subfolder called : includes and put a version of that edited loop-index.php inside it.

PS: if you like to have the same on author loop – look at loop-author.php
search there also for the same filter name and change this line in a similar way – proceed with the changed copy in the same way.

What kind of slider you are using?

look here on a test page the “entry without sidebar” will show your exact Image section
https://webers-web.info/mediation/

now i know what is your request. ( it would be better to have an english screenshot on that ) hard to read for a german user your image
the list of those colors to choose is in class-popup-templates.php

at lines 1473ff there is an array: colored:

$colored = array(
	__( 'Theme Color', 'avia_framework' )			=> $theme_col_key,
	__( 'Theme Color Highlight', 'avia_framework' )	=> 'theme-color-highlight',
	__( 'Theme Color Subtle', 'avia_framework' )	=> 'theme-color-subtle',
	__( 'White', 'avia_framework' )		=> 'white',
	__( 'Blue', 'avia_framework' )		=> 'blue',
	__( 'Red',  'avia_framework' )		=> 'red',
	__( 'Green', 'avia_framework' )		=> 'green',
	__( 'Orange', 'avia_framework' )	=> 'orange',
	__( 'Aqua', 'avia_framework' )		=> 'aqua',
	__( 'Teal', 'avia_framework' )		=> 'teal',
	__( 'Purple', 'avia_framework' )	=> 'purple',
	__( 'Pink', 'avia_framework' )		=> 'pink',
	__( 'Silver', 'avia_framework' )	=> 'silver',
	__( 'Grey', 'avia_framework' )		=> 'grey',
	__( 'Black', 'avia_framework' )		=> 'black',
);

but these are only for named colors
but i do not know if there is a child-theme method to add to that dropdown-list some custom colors.
maybe the filter : avf_alb_popup_templates_named_colors could be used for that

the code from the first lines shows you that there has been a newer file now – and this is only for older masonry

next – yes thats what i try to describe.
If you do have ftp access, what’s the harm in putting a modified file there and seeing if my claim works. This is not Star Trek and the self-destruction mechanism is triggered. If it doesn’t work then you take the whole thing out of the folder. (If it doesn’t work, it is rather because of the made change within the file – because I always test my assertions before).
That was a substitution of a parent file inside the shortcodes – so it is not necessary to build the same folder structure.
If you substitute a file inside e.g. includes folder – there it might be better to build the same subfolders to your child-theme directory.

did you choose to open that image in lightbox?
Under the advanced tab of the image alb element there is that Link option:

where did you generate those pdf’s ;)
look if that document is called LAYOUT1

if you got Acrobat ( not the reader ) you can change it there.
Or on your pdf generating program ( QuarkXPress ) you can name it on exporting.

PS: only chrome i think is showing that dokument name on top of the window. ( Firefox and Safari don’t )

if you are familiar with phpmyadmin – you can have a look into your database tables and look if there is a lot of “overhang”
you can optimize those tables inside that program.

What is my advice now for you. Test duplicator plugin – create those two files – upload it to a testserver and with a new database and see if that is the better way. After a positive result – go and try it on your customer server.

but it has to work even with file compression.
https://webers-web.info/videos/#forcetec
so there must be a different reason on that.

if you are familiar with developer tools you can inspect even the admin window on your browser to get the selectors used there.
with a snippet in your child-theme functions.php you can change the admin area as you like:

f.e.:

function admin_head_mod() {
echo '<style type="text/css">
	#adminmenu, #adminmenuback, #adminmenuwrap { background: #431781;}
	// … and more rules
</style>';
}
add_action('admin_head', 'admin_head_mod');

Enfold provides some additional image sizes to have for their alb elements a better choice.
in functions.php of enfold there are:

$avia_config['imgSize']['widget'] 			 	= array('width'=>36,  'height'=>36);						// small preview pics eg sidebar news
$avia_config['imgSize']['square'] 		 	    = array('width'=>180, 'height'=>180);		                 // small image for blogs
$avia_config['imgSize']['featured'] 		 	= array('width'=>1500, 'height'=>430 );						// images for fullsize pages and fullsize slider
$avia_config['imgSize']['featured_large'] 		= array('width'=>1500, 'height'=>630 );						// images for fullsize pages and fullsize slider
$avia_config['imgSize']['extra_large'] 		 	= array('width'=>1500, 'height'=>1500 , 'crop' => false);	// images for fullscrren slider
$avia_config['imgSize']['portfolio'] 		 	= array('width'=>495, 'height'=>400 );						// images for portfolio entries (2,3 column)
$avia_config['imgSize']['portfolio_small'] 		= array('width'=>260, 'height'=>185 );						// images for portfolio 4 columns
$avia_config['imgSize']['gallery'] 		 		= array('width'=>845, 'height'=>684 );						// images for portfolio entries (2,3 column)
$avia_config['imgSize']['magazine'] 		 	= array('width'=>710, 'height'=>375 );						// images for magazines
$avia_config['imgSize']['masonry'] 		 		= array('width'=>705, 'height'=>705 , 'crop' => false);		// images for fullscreen masonry
$avia_config['imgSize']['entry_with_sidebar'] 	= array('width'=>845, 'height'=>321);		            	// big images for blog and page entries
$avia_config['imgSize']['entry_without_sidebar']= array('width'=>1210, 'height'=>423 );						// images for fullsize pages and fullsize slider

you see that there is featured and featured image and extra_large …

Now is you put an image to your layout or insert to an alb element ( masonry gallery, gallery etc. ) there are default insertions for them.
But you can allways change them by the alb options.
See masonry gallery f.e.: