I suggest a few closely related UI updates to improve usability for users with multiple accounts.
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Give users a way to create/edit labels for their own accounts (e.g. “work”, “friends”, “family”)
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On the smartphone app show the label of the active account at the top of the screen instead of the text “Delta Chat”
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Have a setting to control which screen Delta Chat displays when the app is first opened after starting the device: either the chats of the account which was active the last time Delta Chat was used (current behavior) or the account switcher screen