### Is your feature request related to a problem? Please describe. Deeply nested content on a page is hard to navigate if everything is expanded in the "On this page" outline section. ### Describe the solution you'd like Expand the child headings only when the parent heading is selected and collapse them when focus shifts to another heading. ### Describe alternatives you've considered _No response_ ### Additional context Left most is the current behavior and the other two show the desired behavior.   ### Validations - [X] Follow our [Code of Conduct](https://vuejs.org/about/coc.html) - [X] Read the [docs](https://vitepress.dev). - [X] Read the [Contributing Guidelines](https://github.com/vuejs/vitepress/blob/main/.github/contributing.md). - [X] Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.