Enhancement: improve "use another instance menu"
I suggest to use a Modal component for the "Use another instance" menu, instead of the dedicated page for it. Furthermore, I think the popup "This will erase your local data and disconnect you, do you want to continue?" could be integrated in this modal component with something like "Using another instance will disconnect you and erase your local data."
Also, no error message is issued when the given instance is not correct. I think this should be checed before redirecting the user to the front page.
What do you think about that?