Awful stuff like this wouldn't stand a chance if Google didn't have such a near-monopoly position.
For the sake of the open internet, please switch to a different browser. IMO, Firefox is best*, but even something chromium based is probably fine. Just not Google Chrome.
* On desktop - Firefox is a bit weaker on Android, with an extemely limited set of extensions (but still better than Chrome with no extensions) and just a Safari wrapper on iOS, with no extensions. (But sync works everywhere!)
(I posted something similar in a different thread recently but I think it bears repeating.)
I don't know what you're doing wrong (all I can say is that the name of the collection is case sensitive) but I haven't had any trouble adding the custom collection settings to my Firefox installs.