Let's say you have TableA and TableB
TableA is linked to TableB (TableA_Indexed_Field=TableB_Unstored_Calculation_Field)
You can't display a TableB field on the TableA Layout because TableB_Unstored_Calculation_Field is not an indexed field.
But what is surprising to me is that you can perform a find on a related TableB field from the TableALayout.
It's nice that it works but I find this quite 'funny' that you can search a related field but not display it on the layout.
Any opinion ?