Is There a Way to Disable Email Notification Pop-ups in the App?

To disable your email notification pop-ups, go to your name at the top right of your screen and click 'My Profile'.

In 'My Profile' there is a section titled 'Preferences'. Remove the check-mark from the box labeled 'Display in-app incoming email notification' to stop any further email notifications. 

Select “Update” to save your changes!