Administrators can switch the theme of the Email SecurityAdministrator Portal to Dark mode. It provides a dark background (instead of white) across the UI.
Access the Email SecurityAdministrator Portal.
Go to System Settings > Customization.
Under General, toggle Dark mode to On/Off.
Click Save and Apply.
Note:
Turning Dark mode on/off does not impact the end-users and it is specific to the signed-in administrator. Each administrator can turn the Dark mode on/off for themselves.