khatibpour

The problem I mentioned above was solved.

Note these three points:

One is that like me, do not enable automatic WordPress update, because in this case, if you restore your website backup, it will update itself again.

Second, the 5.7 update seems to have a problem with the elementor (in my case, it was like this), so if you work with the elementor, do not update.

Third, if your situation is like me, you can with wp downgrade, return it to the previous version and everything will be fine, just disable the automatic update before that.

I have a problem almost similar to the WordPress 5.7 update.

(I’m sorry if I can not write good English, unfortunately my language is not good)
After I updated my website,
The elementor and customization icon was removed from the black toolbar at the top of the screen, and some features of the elementor were disabled (such as showing recent posts as slides)

I noticed that there is no problem when a post is in draft mode, but as soon as that page or post is published, the problems I mentioned occurred.