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?