How can I "pin" a document (for easier later use) under Mac OS X?

I’m on a Mac. Is there any way to “Pin” documents for later use? I sometimes get confused about what I’m editing, so the preview isn’t always helpful (and sometimes misleads me).

May I suggest you give a bit of an explanation what “pin a document” means?

Until greater clarity is forthcoming, the act of “pinning” a document (presumably to the Dock) is handled by the operating system (MacOS) and not LO. Even MS Office for Mac cannot pin documents.

The question is similar if not identical one that I have as well - In the list of Recent Documents, as new documents are opened, the oldest are dropped from the list. This is fine most of the time, but one may want to always have a particular document(s) in the list even if not recently opened. I’ve installed the History Master add-on, which allows me to adjust the size of the list (number of most recently opened documents), but it does not allow me to “pin” a document to the list either.

(This is an OS X specific answer, for the sake of answering the OP’s question directly. This doesn’t pertain to LibreOffice, so if this is in appropriate, apologies in advance.)

In OS X, the Dock is divided into two sections. Applications go on the left of the divider. Anything else goes on the right of the divider (the Trash is there, and by default, the Downloads folder, displayed as a stack). You can put frequently used documents on that side of the divider as well (the name of the document will appear when you mouse over it).

Here’s my dock, with a docked LibreOffice template document:

I had this same question regarding pinning documents. My question had nothing to do with the operating system. It was strictly related to LibreOffice Writer. This may work for you if your question is the same. I posted a similar question earlier but being one not to give up easily, I continued experimenting with Writer and accidentally found what I was looking for, accidentally lost it, and had to spend a lot of time finding it again. I have Writer pinned to the Task Bar. I’m using Windows 10 64-bit. I found that when I hold the Right Click button over the icon on the task bar and hold it for 2 or 3 seconds, first you’ll see a menu showing all the Writer windows that are open, then turn loose of the button and a skinny little menu will show up where, when you move the cursor over the items listed, a little pin appears to the right of the document name. If you click on that pin, it will pin the item and retain it in that list. They hid that option very well. I have not found a way to access that list from the File Menu. You can access it only in the way I described. AND, unfortunately, the limit is only 11 documents. Personally, I would like to see a way to increase that list to about 20. But from the responses I’ve seen to questions like this, the techies, which I’m certainly not, don’t even know about this pinned menu. So it is doubtful that there is a way to increase the limit, but I’m going to keep looking. Good luck to everyone who had this issue. It was not something simple to find.