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You cant have on groups tab. But you can create a custom report/dashboard with the fields you want to expose. Tableau server has a repository where all the metadata gets stored. It's a postgresql. Enable readonly user and create the custom report. You can refer to the below video.
Tables information can be found at Workgroups Database - Tableau
Hope it helped.
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It is not possible to customize most of the Tableau Server interface "out of the box" It is possible if you do it yourself if you want to play with the back-end code but you will be unsupported and it WILL break when you upgrade to 2018/2019, making it really not worth it.
For getting the back-end db info, heck yeah you can Matt Coles did a great job here: Shareable Data Sources for Tableau Server
And as Lakshmi mentioned, you can look in the Server admin documentation for the data dictionary of what's available.