Hi Sajin,
You could have raised this as a separate question. But to answer to your question,
In the IDM UI, navigate to Manage tab, there is a field with drop down "Show". In that field if you want to see the users information, select "Identity", for roles - select "roles", for privileges - select "privilege".
If you create a custom entry type and made it as searchable, even that will be listed here.
Since you are saying that you are new to SAP IDM, I would suggest you to start up with the tutorials that comes with the installation of IDM management console. You can check for the tutorials in the folder <installation folder>\tutorial , usualy it ll be something like C:\usr\sap\IdM\Identity Center\Tutorial
And Identity Center General Documents section of IDM documentation is also a good place to start !!
All the best !!
~ Krishna.