WordPress Version 5.5 disables the migration tool known as
jquery-migrate by default. This breaks the features and functionality of many Elementor utilities and widgets.
Currently, we know of several issues with Elementor and WordPress 5.5:
Here's the Elementor support response that we're seeing:
Let's talk about some fixes. First, the two listed issues are known problems. If you have any other problems, it may be due to another plugin or a cache.
First, clear your cache and regenerate CSS. On a staging site deactivate all plugins to see if it's a plugin issue.
The real fix to all of your problems here is to roll back to WordPress version 5.4.2, and wait for the "all clear" from the Elementor devs. To do that, get this plugin
Before doing anything, back up your WordPress website. We use Updraft Plus, and All In One WP Migrate is another good option. After doing that, go to this options page (found in settings), and change the target version to "5.4.2".
Click "reinstall now", and you'll be back to a working combo of WordPress+Elementor.
If you really want to keep V5.5 live, you can also use this plugin to re enable, which (according to the WordPress devs) "[enables] the migration script for your site to give your plugin and theme authors some more time to update, and test, their code."
Download and activate, everything else happens automatically. You may want to clear your cache in this situation too.
Good luck! Post any other known issues in the comments section below.