Hello,

I have deactivated the child theme and added text block to the About us page: https://gyazo.com/3401ba4adf56321696b93dca064a56a1

At the same time, as you can see the element is empty, and to see the settings, you need to switch between the tabs. https://gyazo.com/526af9464494e626ad7ed2518e262933

Please try to delete and upload WP bakery plugin again. You would better make the full backup of your site.

Best Regards