Change the Show data as part of the reference field. It is under More Options.

Rafael said:
transfer all less the Activitie_Name' only transfer the Number 3 no the Activity Name

 It is probably because you are not pointing to a text field. The field 'Activity_Name' is a reference field. In 'History Hours' the field Activity is a text field. The code in your Add Register button is:

let me := this;
let myA := Activity_Name;
let newL := (create 'History Hours');
newL.(
    'N1_Staff Hours' := me;
    'Staff:' := me.'N1_Staff Project'.Name;
    'DestID:' := me.ProdID;
    'Hours:' := me.'Hours Weeks';
    'Week:_' := me.Week;
    'Activity:' := me.Activity_Name
);

So on line 10 you are telling Ninox to only copy the record Id to the field 'History Hours'.Activity. Maybe try the following change:

'Activity:' := myA.'Activity Name'

or if you want to use the me variable:

'Activity:' := me.Activity_Name.'Activity Name'

If you do use the me variable then you can get rid of the myA variable since you don't use it all.