What does 'Range' do in the menu element?
The 'Range' in the menu list item element sets which list items at the current level the settings should apply to.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
Running the composer update command will update any composer packages that have newer versions available.
Opacity is set using a decimal where 0 is transparent, 0.5 is 50% and 1 is solid.
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.