Leave Entitlements are applied and can be either changed or removed on the Timesheet Template.
Generally every Timesheet template (and therefore timesheet entry) should have a Leave entitlement transaction. These are required to accrue leave correctly each payrun. If they are removed generally the leave will not be correct.
2. Change the Leave Entitlement Pay Element to the new entitlement and save the transaction.
To set up a new Leave Entitlement see article: Leave Entitlement Pay Elements under the Getting Started section