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kora bornkora born 

Display Fields from Related Records

From https://trailhead.salesforce.com/modules/visualforce_fundamentals/units/visualforce_standard_controllers:

"For example, while viewing the object details for Account, you might have noticed that the Account object has a field called Account Owner, and that its type is Lookup(User)."
All I see is a popup and ability to change user. I dont see any "Lookup(User)"

Also:How do I get to this: "And, if you from Setup click Customize | Users | Fields" ?? I tried all the various Setups in the various consoles, none had this. I also did a search 
SandhyaSandhya (Salesforce Developers) 
Hi,

After creating a account when you see the detail page of the account ,you can see the Account owner is changable with User lookup filed.

Lookup is the data type of the field, here user which you can change is called lookup field for Account.

User-added image

Also refer below link.

https://help.salesforce.com/articleView?id=custom_field_types.htm&type=5
 
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya
 
kora bornkora born
Thats a Classic screen. Things have changed under L. Maybe the tutorials have not updated content fully.
I finally found it under Setup/Objects. Thanks.