You can change the number of months that you can carry forward leave into by updating the Carry forward leave - Number of months you can use carried forward days or hours global setting.
📌Note: If the setting is already set to 0 (Zero), you can't carry any days or hours.
To access and amend this global setting, follow the steps below:
Depend on your system configuration click Configuration or Admin menu then click Settings.
Click System Settings then click Global.
Search for and select Carry forward leave - Number of months you can use carried forward days or hours.
In Integer, enter the number of months.
Click Save, then run batch updates.