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Roman RegmiRoman Regmi 

Select fields to display greyed out for detail of master detail relationship.

I am opening the app as an admin.User-added image 
I have no idea why I can't select the fields. I can read/write on them. 
Best Answer chosen by Roman Regmi
Sai PraveenSai Praveen (Salesforce Developers) 
Hi Roman,

For recently viewed Listview you cannot change or rename or add extra fields. Can you try creating a new list view and check.

If this solution helps, Please mark it as best answer.

Thanks,