If I change a Helper layout, will it change where it's used?
No. Helpers are coupled with the page once placed. Changes to the Helper layout will not affect existing instances.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
You can style tables or forms through the use of base or custom styles.
No, the entity browser does not work for component defaults as the entities are content, not config.