Menu not showing in single post template

You can see menu is showing on my homepage: https://www.hairs.london/
But not showing on posts: https://www.hairs.london/30-easy-to-maintain-ideas-for-medium-length-hairstyles-with-bangs/

Upon accessing a post, I navigate to the TagDiv Composer, where I modify the single post template by incorporating a menu element. While this adjustment reflects in the post, it inadvertently manifests on the homepage as well, resulting in the display of two menus. Consequently, I find it necessary to eliminate the menu from the single post template. I seek guidance on a viable solution to address this issue.