This is a feature which allows you to change your login email address. Once you change it, you will be redirected to the login screen to sign in with your new login credentials.
After the change, you will have to confirm the changes by clicking the link which you will receive by email.
A. Click on your avatar icon, which is located at the top right side of the screen.
B. Select "My profile" in the sub-menu.
C. Select the “change” button next to your email address
D. Enter the new email address and submit the form.