Collapse / Expand ALL categories with "one click"

[kubMCC]

Hi guys,
Collapse/expand: (Where) can I find this function? Only for the main forum page.
Sometimes it's very annoying to do this for each category to get an overview again.
Location: maybe at the end of the page, besides the "mark all read"
Danke!

It would give our users a very quick way to get back to the organized Overview. OK, it's a very detailed structure, but that's how it is .... 

After a couple of weeks my users asked me the question I mentioned before:

"Is there a way to collapse all themes with one Click?" The "tree" of forum is well accepted, but ....

Anyone willed to create a MOD? (PM wellcome  )

Screenshot in the linked quotes.

Thanks in advance / Vielen Dank im Voraus