Limited functionality of tools in the admin panel. How to revive?

Question

WordPress

Hello!
After changing the hosting and domain, the "Expand/hide menu" buttons on the left panel ( id="collapse-button" ) stopped working in the admin panel.
Also, the tool (“tick”) “Select All” does not work on the page “All Records”, “Library of Media Files”, “Pages”, Updates, etc. ( id="cb-select-all-1" ).


It seems like a trifle, but if you need to delete 5-10 files or update several plugins, some inconvenience is created. The problem does not depend on the operating system, browser, or display device.
WP tried to re-upload, the problem is actual. In the console - only "notice" about jqmigrate

What could be the problem?
Thanks in advance for your replies.

Answer 1

It looks like you have the same issue that you had when you upgraded Wordpress to 5.5.
Try enabling the plugin https://wordpress.org/plugins/enable-jquery-migrat...
Here are the details: https://wordpress.org/support/topic/read-this-firs... (read the jQuery Migrate section is disabled by default).