Wordpress 5.5.1
Hi! I have some problems when I save my site responsive version. As you told I've updated theme, plugin and Wordpress at the latest version.
I'll explane my problem: when I'm going to do responsive section, I'll save and the final part of the page disappear...
Can you help me? Thank you 
Comments
Please provide us with your hosting environment settings, to do that please follow these steps:
1) Go to the Wordpress > Tools > Site Health [Links visible only for registered users]
2) Click at the “Info” on the top of the page and open the “Server” tab [Links visible only for registered users]
3) Take a screenshot of the content inside that ‘Server’ tab [Links visible only for registered users]
Please make sure you are using Wordpress 5.2 or later, previous versions did not have this option built in.
Please use snag.gy or pasteboard.co to host the screenshot and send us the link to it.
Thanks