If you want to log out all devices currently connected with your Bitpanda account, click on the menu item Security and navigate down to the category Activity Log. There you can click on the button Logout all sessions.
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Furthermore, you are able to see all devices which are or were connected to your account. Also, you can decide individually whether you want to remove this specific device's connection or just end the actual session on that device.
In order to connect a new device, you need to confirm this via email.