Force display RAW, copy buttons…

You can create 2 custom themes which are setting the different button styles – see https://github.com/EnlighterJS/documentation/blob/master/Tweaks.md

EnlighterJS v3 is designed to be controlled via CSS to give end-users a easy way to change such things without getting in touch with the highlighting library itself.

please read the docs: https://github.com/EnlighterJS/documentation/blob/master/wordpress/ExternalThemes.md

the easiest way is to use the theme customizer to extract/get the css.
alternatively you can use the EnlighterJS themes from the repository (just copy the third line, the second one contains the base styles which are already available due to the global theme file)

great. there is an issue with the css enqueue dependencies for external themes in v4.1 – it has been fixed in v4.2