Prevent Mail.app from opening in split view

After installing macOS Mojave, Mail.app always opens in split view when I am in a fullscreen space. Two examples:

  1. I am in fullscreen Safari and click a mailto link: an email composition window opens in split view.
  2. I am in any other fullscreen space and I click a notification of a new mail: the mail opens in split view.

Is there any way of preventing that from happening and instead opening Mail.app in a normal window?


Go to Mail -> Prefrences:

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Then click on general and untick this box:

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After unticking the box mail should return to its previous behaviour.