I have created a custom menu using the external link option but using internal links. The problem i have is that these items are not hightlighted as active when on those pages so how to make them show as active?

Unfortunately still no way with core functionality. It has been asked for years 😞

• https://invisioncommunity.com/forums/topic/448146-active-menu-item-for-a-subforum/
• https://invisioncommunity.com/forums/topic/431732-menu-item-internal-links/
• https://invisioncommunity.com/forums/topic/447436-main-menu-highlight-is-not-working-on-all-tabs/
• https://invisioncommunity.com/forums/topic/437154-can-you-fix-the-menu-active-state-oversight/