Hi Nuddle,
Could you share me version of your marketing application?
From your screenshot, it seems that your environment would be old version.
In my marketing application 1.35.10059.1039, it will display a drop down menu for me to select segment type,

Then it will firstly let me set a name for segment, and there is a new field "Time Zone":

The list member view is in the Member tab, I can customize "Segment members" view to modify columns.

Please check whether there is a view in your environment which contains "segment" in its Name property.
If such view not exists, you could upgrade your marketing application to make the view be customizable.
Regards,
Clofly