Yes, you did. You are not alone. The quickest way to find it, is click on the magnifying glass (search) in the side bar, and search for it through the view all boards option:
Once you have selected it, it will appear in the list of most recent boards under search, as you can see in the above screenshot. The list is limited, though. So if you have more boards you frequently use, I would recommend adding a browser bookmark to it, so you can easily find it when you need it.
There's an article explaining what has happened to boards in the new JIRA UI.
@Alan Erwin Guerra Saavedra, first let me ask if you are on cloud or server? Second, if by "settings boards" you mean the ability to configure the board then that ability for sure is still there. If you use cloud, below is a view of my board showing it is there. If you are on server I'm sure the board
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