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:


I am in fullscreen Safari and click a mailto link: an email composition window opens in split view.
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:



Then click on general and untick this box:



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