How can I switch between dark and light theme?

On desktop: 

In the conversation list:

  1. Click Settings Settings16x16.png .
  2. Click Options.
  3. Activate or deactivate Dark theme.

On mobile phones and Android tablets: 

In the conversation list:

  1. Tap your Profile in the upper left corner.
  2. Tap Settings Settings16x16.png .
  3. Tap Options.
  4. Tap Dark Theme to toggle between dark and light theme.
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