The MMS documentation has a sidebar link on the left hand side.

Some sections (e.g. MMS Monitoring, MMS Backup) have sub-sections that expand.

However, only the first link seems to be clickable - as in, you can click it once to expand it, and once expanded, you can also click it to go to a TOC page for that subsection.

However, the second and third links are not - you can click to expand them, but subsequent clicks do not take you to the TOC for that subsection. The only way to open them seems to literally be to right click on the link, and "Open in a new tab".

Maybe there's an issue with the JS on the page doing the auto-expand?