How to update 'Accrue on' option for an existing absence plan

Summary: we have an accrual sick day plan created before the 24A release. We noticed a new field on the Accrual tab for the absence plan called 'Accrue on', and two options state to accrue at the end of the repeating period or the beginning of the repeating period. Currently, the plan is defaulted to the end of the repeating period. Is there a way for us to update the plan to use the beginning of the repeating period option? Just wondering if we have to create a new plan in order to update the 'Accrue on' option. Thank you.