Is there a way that I can PIN a folder in DO? I have several folders that I use frequently. If I could pin them, and then when I navigate within those folders, they would open in new folders. That way, I could always have a set group of folders I can get to quickly.
they would open in new folders
Do you mean tabs?
Have you tried tab groups?
Locked tabs may also be what you're looking for. See the bottom of https://www.gpsoft.com.au/help/opus12/index.html#!Documents/Tabs.htm
You can also have toolbar buttons which take you to your most used folders, of course.