Hi,
We apologize for the difficulties the plugin is causing for you. We can see this is a bit frustrating. We are happy to help. We would like some more information as this can help us troubleshoot and rule out or in possible issues.
1. We had another recent release. Can you confirm you are using the most recent Yoast SEO, v14.9? If you update, does the issue resolve?
2. Can you confirm you are using WordPress 5.5.1? You can check by clicking on the W in the top left and selecting About. If you need to update, please check with your host provider.?Please know that if you are using an older version of WordPress Core you may experience unexpected behavior with Yoast.?This guide explains more:?https://yoast.com/why-we-dont-support-old-wordpress-versions/.
3. Are all your non-Yoast plugins and themes also updated?
4. If you check for JavaScript errors (we are not sure if this was done, exactly) do any appear on that page in the backend? Can you describe them or take a screenshot? If you are not sure how to look for JavaScript errors please use this guide https://yoast.com/help/how-to-find-javascript-errors-with-your-browsers-console/.
5. When you say it breaks, can you take a screenshot of what this looks like? Or describe what breaks? For example, are you able to edit and add blocks but the sidebar doesn’t work?