I'm using a menu block to output a section of my main menu into a region so I can have a "In This Section" type of sub menu on every page.
Unfortunately, I can't find a way to pinpoint in menu.html.twig which rendition of "main_menu" I am working with. (they both have the same "menu_name") I want to adjust the markup for the menu block, but not for my main menu.
A similar question was asked here: Additional twig suggestions for menus in Drupal 8
I don't quite understand the suggested answer. Is there some way I can extend some class to call a different Twig Template? Is there some hook I'm missing?