When using JetPack, how do I fix videos not being embedded responsively into my content?
If you're using JetPack, you may have noticed that your videos are no longer displaying responsively as they should within the content of your pages and posts.
To fix this, disable the "Shortcode Embeds" module of JetPack.
For some reason, starting in JetPack 5.5, they hide the menu from you to disable individual modules. But it can be accessed by going to the following URL:
So from there, you'll click to disable the "Shortcode Embeds" module.