In a Music (or Film) library create a Smart Collection (if there aren’t any) then switch to the Collections view for the library.
In a browser this results in incorrectly showing All - Artists - By Title (for Music libs) and All - Movies - By Title (for Film libs). As such, there is no way to access Collections from a browser. At least this is the behaviour I have seen for some time now (across various updates).
Other clients (e.g. Windows desktop player and HTPC app) correctly show the list of Collections.
Web: Version 4.87.2
Server Version 1.30.1.6550