Post Item B

There is a “Content Container Width” option for post. It can be set from 50% to 100%. This post is 80% width.

demo10-h1
demo11-v1
demo07-v1
demo08-v1

All the elements in the container will be limited in 80% width.

Anyway you can also set fullwidth for a particular element:

demo04-h1
Thanks!