Hi @Anonymous ,
Do you want to customize these three collections: RequesterBalanceCollection, LeaveCollection, BalanceCollection?
If so, you not only need to modify the formula in App.OnStart, but also you need to change all the formulas about these three collections.
For example: HomeScreen's OnVisible, LeaveBalanceScreen's OnVisible,ComfirmationScreen's OnVisible, ManagerChangeRequestScreen's OnVisible, ManagerSendEmailScreen's OnVisible,etc.
Please check all the formulas one by one. Anyone related can not be left.
Actually, customize a template is a little complex.
I recommend you refer template and create a similar app by yourself. Everything will be more easier.
Best regards,