I am also trying to switch vaults.
I can click on the vault icon on the bottom left of my Obsidian window (on iMac running Mojave) and it says “Open another vault.” I then get three choices:
Open folder as vault
Create new vault
Open help vault
I can create a folder in Dropbox and then open it fine (first option). But what I also want to do is prevent Obsidian from opening another vault that I had set up by mistake. When I click on the “x” to close it, it says “Can’t remove a currently open vault.”
This is not what I am expecting and I am wondering what I am doing wrong. It seems to me that selecting another vault should “deactivate” the “wrong” vault and it should then be possible to unlink it from Obsidian.