Thank you Ofi! Now i must do this in every website after update helix ultimate?

Unfortunately, yes. You have to just change it from col-xl-10 to col-xl-12.

I have a humble request. It would be very kind of you if you can manage some moment to give us feedback here:

1. JED
2. Trustpilot

Maybe use custom CSS instead to increase width.

BTW

There is mistake inside customized file. Somebody forgot to put " - after col-xl-12.

After the last Helix update the problem exist again and in templates/shaper_helixultimate/html/com_content/article/default.php are no files? How and where i can increase the with?

Those views where moved into plugin folder. I've written more about it here: https://www.joomshaper.com/documentation/helix-framework/helix-ultimate-2/template-views-override

read steps, focus on 2.