Hi @Madhumita_Prahallad1 , it looks like you have the new task details pane update and that might be the cause, different to the expected behaviour I mentioned above.
If the user doesn’t see it in a project, it may make sense that all fields are now no longer visible, even ones in the library, because they are now ‘grouped’ within projects in the new task details pane design.
@Garrett_Knoll , @Peyton_Lee , @lpb, take a look 