Object Manager BUG

I do like to quickly see just layers without objects. There is an option for that in 2018 and has been for many versions, called Current Page Layers Only. This doesn't exist in 2020 (probably 2019 as well but who can check, I certainly can't as its banished)

However if you hover over the layer dropdown arrows used to display or hide objects a tooltip pops up to say Ctrl-Click to collapse all. Great thats what I needed.

Doesn't work. Grrr.