In Navbar also all children of current page are highlighter

Hi, I'm not sure if this is a bug, a feature or simply a misusage. When I navigate to a page, that is included in the main menu, and this menu items as submenus, then also all of those submenues are highlighted as well. I find this confusing, is there a way to only highlight the current page I'm on? For example: http://youlius-award.de/youlius-2018 When select the menu "Archive > Youlius-Award 2018", you will see, that all three subitems (Nominierungen, Video, Gewinner) are also highlighted in yellow. Thanks for your support. Andreas