Hi,
I found the solution. The problem caused couple lines in my child ->functions.php file. I removed it and theme works now.

$builder = new AviaBuilder();
$builder->setMode( 'safe' ); 
$builder->setFullwidthElements( array('av_revolutionslider', 'av_layerslider' ,'av_slideshow_full', 'av_fullscreen', 'av_masonry_entries','av_masonry_gallery', 'av_google_map', 'av_slideshow_accordion', 'av_image_hotspot', 'av_portfolio', 'av_submenu', 'av_layout_row', 'av_button_big') ); 

The topic can be closed.
Best Regards,
Jacek

Hey Elliott,
Chrome get it, but on Firefox and new Edge it doesn’t work.

BR
Jacek

Hey Yigit,
Thank you for advice. With widget I have search box exactly the same as doing it like in the topic I mentioned. Can you look again and tell me -how to horizontal center it with good looking shrinking, please?
For now it’s to high. When I do top margin, it will destroy header shrinking :/

Hey Elliott,
it works perfectly. Thank You!!

Best Regards,
Jacek