@Ismael : can you erase from GitHub Library on “Online Resources from Third Party Developers” the
“Disable loading of Google fonts and host them on your on server by Guenni007Disable loading of Google fonts and host them on your on server by Guenni007”
it is a bit deprecated since Enfold Font Manager is established.

Don’t get me wrong: the marquee tag is long outdated (and probably the effect too ;)), but you can use a keyframe animation for this element, for example.

F.e. see page and code on that page: https://enfold.webers-webdesign.de/partnerlogo-element/

what you try to influence on the hamburger script file?

you can deregister the parent script and register child-theme edited files then.
My recommendation is to have the same tree structure as the parent – create a js subfolder in your child-theme directory.

if you use the option of enfold to use minified files – you had to upload both files – in your case:
avia-snippet-hamburger-menu.js and avia-snippet-hamburger-menu.min.js

to get the minified version you can use this : https://codebeautify.org/minify-js

put this in your child-theme functions.php :

function wp_change_hamburger_script() {
  $vn = avia_get_theme_version();
  $child_theme_url = get_stylesheet_directory_uri();
  $min_js = avia_minify_extension( 'js' );

  wp_deregister_script( 'avia-hamburger-menu' );
  wp_enqueue_script('avia-hamburger-menu-child', "{$child_theme_url}/js/avia-snippet-hamburger-menu{$min_js}.js", array('avia-default'), $vn, true);
}
add_action( 'wp_enqueue_scripts', 'wp_change_hamburger_script', 100 );

have a look at : https://webers-testseite.de/bemopriv/
the heading had to be styled for responsive case – but I didn’t feel like doing that anymore.

the layout is based on a grid-row element

this is the enfold shortcode of the grid-row:

[av_layout_row min_height_percent='percent' min_height_pc='60' min_height='0' border='' fold_type='' fold_height='' fold_more='Read more' fold_less='Read less' fold_text_style='' fold_btn_align='' color='main_color' fold_overlay_color='' fold_text_color='' fold_btn_color='theme-color' fold_btn_bg_color='' fold_btn_font_color='' size-btn-text='' av-desktop-font-size-btn-text='' av-medium-font-size-btn-text='' av-small-font-size-btn-text='' av-mini-font-size-btn-text='' fold_timer='' z_index_fold='' mobile='av-flex-cells' mobile_breaking='' mobile_column_order='' id='' custom_class='full-bg-image' template_class='' aria_label='' av_element_hidden_in_editor='0' av_uid='av-m6f9v8gq' sc_version='1.0']
[av_cell_three_fourth vertical_align='middle' padding=',,,' av-desktop-padding=',,,80px' av-medium-padding=',,,80px' av-small-padding='3' av-small-padding_sync='true' av-mini-padding='20' av-mini-padding_sync='true' background='bg_color' background_color='' background_gradient_direction='vertical' background_gradient_color1='#000000' background_gradient_color2='#ffffff' background_gradient_color3='' src='' attachment='' attachment_size='' background_attachment='scroll' background_position='top left' background_repeat='no-repeat' link='' link_dynamic='' linktarget='' title_attr='' link_hover='' mobile_display='' mobile_col_pos='0' custom_class='' template_class='' av_uid='av-m6f9ukqb' sc_version='1.0']

[av_four_fifth first min_height='' vertical_alignment='av-align-top' space='' row_boxshadow_width='10' row_boxshadow_color='' margin='0px' margin_sync='true' av-desktop-margin='' av-desktop-margin_sync='true' av-medium-margin='' av-medium-margin_sync='true' av-small-margin='' av-small-margin_sync='true' av-mini-margin='' av-mini-margin_sync='true' mobile_breaking='' mobile_column_order='' border='1' border_style='solid' border_color='#000000' radius='15' radius_sync='true' min_col_height='' padding='30' padding_sync='true' av-desktop-padding='' av-desktop-padding_sync='true' av-medium-padding='' av-medium-padding_sync='true' av-small-padding='' av-small-padding_sync='true' av-mini-padding='' av-mini-padding_sync='true' svg_div_top='' svg_div_top_color='#333333' svg_div_top_width='100' svg_div_top_height='50' svg_div_top_max_height='none' svg_div_top_opacity='' svg_div_bottom='' svg_div_bottom_color='#333333' svg_div_bottom_width='100' svg_div_bottom_height='50' svg_div_bottom_max_height='none' svg_div_bottom_opacity='' fold_type='' fold_height='' fold_more='Read more' fold_less='Read less' fold_text_style='' fold_btn_align='' column_boxshadow_width='10' column_boxshadow_color='' background='bg_color' background_color='rgba(0,0,0,0.5)' background_gradient_direction='vertical' background_gradient_color1='#000000' background_gradient_color2='#ffffff' background_gradient_color3='' src='' attachment='' attachment_size='' src_dynamic='' background_position='top left' background_repeat='no-repeat' highlight_size='1.1' fold_overlay_color='' fold_text_color='' fold_btn_color='theme-color' fold_btn_bg_color='' fold_btn_font_color='' size-btn-text='' av-desktop-font-size-btn-text='' av-medium-font-size-btn-text='' av-small-font-size-btn-text='' av-mini-font-size-btn-text='' animation='' animation_duration='' animation_custom_bg_color='' animation_z_index_curtain='100' parallax_parallax='' parallax_parallax_speed='' av-desktop-parallax_parallax='' av-desktop-parallax_parallax_speed='' av-medium-parallax_parallax='' av-medium-parallax_parallax_speed='' av-small-parallax_parallax='' av-small-parallax_parallax_speed='' av-mini-parallax_parallax='' av-mini-parallax_parallax_speed='' fold_timer='' z_index_fold='' css_position='' css_position_location=',,,' css_position_z_index='' av-desktop-css_position='' av-desktop-css_position_location=',,,' av-desktop-css_position_z_index='' av-medium-css_position='' av-medium-css_position_location=',,,' av-medium-css_position_z_index='' av-small-css_position='' av-small-css_position_location=',,,' av-small-css_position_z_index='' av-mini-css_position='' av-mini-css_position_location=',,,' av-mini-css_position_z_index='' link='' link_dynamic='' linktarget='' link_hover='' title_attr='' alt_attr='' mobile_display='' mobile_col_pos='0' id='' custom_class='' template_class='' aria_label='' element_template='' one_element_template='' av_uid='av-t574on' sc_version='1.0']

[av_heading heading='FREEZE FLAT™' tag='h1' style='blockquote modern-quote' subheading_active='subheading_above' show_icon='' icon='ue800' font='entypo-fontello' size='' av-desktop-font-size-title='48' av-medium-font-size-title='42' av-small-font-size-title='36' av-mini-font-size-title='28' subheading_size='' av-desktop-font-size='36' av-medium-font-size='28' av-small-font-size='24' av-mini-font-size='20' icon_size='' av-desktop-font-size-1='' av-medium-font-size-1='' av-small-font-size-1='' av-mini-font-size-1='' color='custom-color-heading' custom_font='#ffffff' subheading_color='#ffffff' seperator_color='' icon_color='' margin='' margin_sync='true' av-desktop-margin='' av-desktop-margin_sync='true' av-medium-margin='' av-medium-margin_sync='true' av-small-margin='' av-small-margin_sync='true' av-mini-margin='' av-mini-margin_sync='true' headline_padding='' headline_padding_sync='true' av-desktop-headline_padding='' av-desktop-headline_padding_sync='true' av-medium-headline_padding='' av-medium-headline_padding_sync='true' av-small-headline_padding='' av-small-headline_padding_sync='true' av-mini-headline_padding='' av-mini-headline_padding_sync='true' padding='10' av-desktop-padding='' av-medium-padding='' av-small-padding='' av-mini-padding='' icon_padding='10' av-desktop-icon_padding='' av-medium-icon_padding='' av-small-icon_padding='' av-mini-icon_padding='' link='' link_dynamic='' link_target='' title_attr='' id='' custom_class='iceglas' template_class='' element_template='' one_element_template='' av_uid='av-m6e7xj5g' sc_version='1.0' admin_preview_bg='']
The Original
[/av_heading]

[/av_four_fifth][/av_cell_three_fourth][av_cell_one_fourth vertical_align='bottom' padding='' padding_sync='true' av-desktop-padding='' av-desktop-padding_sync='true' av-medium-padding='' av-medium-padding_sync='true' av-small-padding='' av-small-padding_sync='true' av-mini-padding='' av-mini-padding_sync='true' background='bg_color' background_color='' background_gradient_direction='vertical' background_gradient_color1='#000000' background_gradient_color2='#ffffff' background_gradient_color3='' src='' attachment='' attachment_size='' background_attachment='scroll' background_position='top left' background_repeat='no-repeat' link='' link_dynamic='' linktarget='' title_attr='' link_hover='' mobile_display='' mobile_col_pos='0' custom_class='' template_class='' av_uid='av-u4sunr' sc_version='1.0']

[av_video src='https://www.youtube.com/watch?v=W73GdyDSHuU' mobile_image='https://webers-testseite.de/wp-content/uploads/dynamic_avia/avia_video_thumbnails/youtube/W73GdyDSHuU/W73GdyDSHuU.jpg' attachment='49853' attachment_size='full' video_autoplay_enabled='aviaTBvideo_autoplay_enabled' html5_fullscreen='aviaTBhtml5_fullscreen' format='16-9' width='16' height='9' conditional_play='' id='' custom_class='' template_class='' element_template='' one_element_template='' av_uid='av-m6f9u95o' sc_version='1.0']

[/av_cell_one_fourth]
[/av_layout_row]