Brown folders aren't collections. There are libraries, i.e. either "My Library" or groups you're a member of. You can indeed not rename or remove "My Library". Groups can be renamed by their owner on the website, which is also where you can leave groups (at which point they'll disappear from Zotero after syncing).

Maybe you can step back a bit and explain what more specifically you're trying to achieve -- starting with why you'd have a bunch of groups that you want to treat like collections. The reason you need to do this on the website is that groups are intended for collaboration, so this needs to happen in a central location.

But it sounds like you may be misunderstanding how Zotero data works more generally. If you just want collections, why not use, well, collections for that purpose?

FWIW, though, as a group owner you can delete a group, but note that you'll lose everything in that group.

yes, exactly.
(And I don't mean to nitpick, but they're groups, not collections: that's important not because I care that you're using the right words, but so you can find the right place to see and delete them and if there are any problems, describe them accurately. Online they're all listed here: https://www.zotero.org/groups
and you can delete them after clicking "Manage Profile" -- obviously only after you've transferred their contents)

Adam, I just saw your comments from a year and a half ago. Thank you so much for posting, and also for posting on how to remove groups (my new question today). I'll have to digest all this, especially now that Zotero has changed its format to standalone only (not sure, but something has changed). I am still learning how to transfer contents (export, CVS, save, reopen, and save with Excel workbook, then edit. I still cannot figure out how to export a bibliography in Chicago format to a Word document. I thought that was possible. . .

I have a collection. Almost 300 entries (books, webpages, articles, pictures, posters, you name it). I want to remove it from Zotero (because apparently I cannot save new titles unless I buy more storage, which I am unwilling to do). So before deleting that collection, I want to save it in a recognizable bibliographic format, such as Chicago Humanities. The only thing I have been able to do thus far is to export my collection into a cvs format (no choice there; I went to "File" and "export"), save it on "Desktop;" then open it again and save it in Excel Workbook format (if you keep it saved in cvs, comma delineated, it opens up all jumbled). Does any of this makes sense?

One of the reasons I want to export the collection is that a lot of its urls are dated and not working anymore, and I have lots of duplicates. Also, I am done with this particular research and want to post the result of the bibliography, organized, in Chicago Humanities format, online.

Hi dstillman, thank you for all your help, I really do appreciate it.

First point, I don't even know if the Zotero icon is standalone or Firefox-linked. There is absolutely no indication. . . I know I installed both. . . I heard you about syncing. I will remember that. I probably need to watch an intro video rather than trying to reinvent the wheel. . . If the full Firefox extension is discontinued, then how do we save new items?

Generating a bibliography. . . I right-clicked on the collection's title and the only option was to "export" (hence, cvs, Excel, etc.)

OH, and this shows up in my library's box: "Zotero groups" (3 of them) and "Zotero settings" -- what should I do with them? Delete?

OK I think I understand. All you have to do is highlight the entire list of titles. I'll try this with my 309 titles. . .

It saved in an unrecognizable format. had to open it with Word, only to find that this is NOT the format I need. I need Chicago Humanities, and this is not an option. . .

I would strongly recommend spending some time reading through our documentation to start. There seems to be a huge amount here that you're misunderstanding.

If the full Firefox extension is discontinued, then how do we save new items?

https://www.zotero.org/blog/zotero-5-and-firefox-faq/

Generating a bibliography. . . I right-clicked on the collection's title and the only option was to "export" (hence, cvs, Excel, etc.)

If you right-click on a collection in Zotero, "Create Bibliography from Collection…" is an option. But I think the problem is that you keep referring to group libraries as "collections". As adamsmith explained to you above, those aren't the same thing, and if you keep doing that that's going to keep resulting in a lot of confusion.

If you want to generate a bibliography from all items in a group library, you can only do so by selecting all items and using right-click → "Create Bibliography from Items…".

And how about the yellow triangle that says, "You have reached your Zotero file storage quota. Some files were not uploaded etc. and it prompts me to buy more storage? That's why I want to delete stuff.

As I say, that's for syncing files to your online library and other computers. You can still use Zotero locally without limits.

OH, and this shows up in my library's box: "Zotero groups" (3 of them) and "Zotero settings"

I don't know what this is referring to. Are you looking on the Zotero website? Everything we're talking about here is in the Zotero program on your computer, not on the website.

It saved in an unrecognizable format. had to open it with Word, only to find that this is NOT the format I need. I need Chicago Humanities, and this is not an option. . .

"Chicago Humanities" isn't a citation style. The style guide is called the Chicago Manual of Style, and that's what Zotero calls the various Chicago-based styles, of which there are various subformats.

Phew. I am done creating bibliographies and putting collections in order, deleting groups. Next stop: a training video.