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.
No, you cannot use SCSS variables in your codebase inside the Acquia Cohesion interface.
Color tags allow you to create groupings of colors based off of the color tags that you define in the website settings color palette.
The 'Range' in the menu list item element sets which list items at the current level the settings should apply to.
To use an SCSS variable, enter your chosen variable into the appropriate CSS property.
Yes, this is possible by creating a custom element.
The Youtube video embed is responsive so it should expand to the width of its parent. If you do need to set a width you can apply the Width CSS property through the Style Builder.