Step one: Sign in like usual.
Step 2: Click the Server list in the upper right of the client.
Step 3: Log out of the account
Step 4: Enter Login info for account 2
Step 5: Rinse and repeat for all your accounts.
While this isn't perfect, and the info isn't saved, this is at least a temporary workaround to play multiple accounts on the new client, without having to use multiple of the clients. I hope this helps some.
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