Great! This customization feature is new and still has not reached its full potential. We should probably make customization of displayed columns easier (e.g., available in Slicer application settings) because preferences are always user and workflow dependent.
I’m just wondering why. Series number is a simple number, guaranteed to be unique within the study, monotonously increasing (except maybe secondary captures and other reports). Looking up series based on date and time is much harder and less robust: there are 12-15 digits to compare, anonymization may shift the date&time values, there may be difference in how various software handle date&time formatting, time zones, etc.