You're looking at a macro or Extender to help with that - unless the field is controlled by a security option.

Macro actually; I already have a customized screen on VBA form; like my own Post button  and hid the real one; etc

I have macro programming to make a prepayment  (not what I do here)  - the thing I don't have is a controls list to make a field disappear on the pop up screen.

Thanks

So you can get control of the pop-up screen controls in the OnPopupOpened event similar to this method:

If strPopupName = "frmDetail" Then
    For i = 1 To PopupCtls.Count
        debug.print CStr(i) & ", " & PopupCtls(i).Caption & ":" & CStr(PopupCtls(i).Top)
        If PopupCtls(i).Caption = "Optional Fields" Then
            PopupCtls(i).MacroEnabledFlag = False
        End If
    Next i
    PopupCtls(11).MacroEnabledFlag = False
End If

So you can get control of the pop-up screen controls in the OnPopupOpened event similar to this method:

If strPopupName = "frmDetail" Then
    For i = 1 To PopupCtls.Count
        debug.print CStr(i) & ", " & PopupCtls(i).Caption & ":" & CStr(PopupCtls(i).Top)
        If PopupCtls(i).Caption = "Optional Fields" Then
            PopupCtls(i).MacroEnabledFlag = False
        End If
    Next i
    PopupCtls(11).MacroEnabledFlag = False
End If

Thanks much

Totally the answer.