When you click Calculate Balance, the accrual calculator will appear. On this page, you can select the time off category you would like to review (this defaults to the same category you hovered over to access the accrual calculator) and enter a future date to give you the projected time off balance you will have accrued by that day.
Click Accrual Details, and the accrual calculator shows all applicable time off actions from an earlier date to a projected future date. In the above screenshot, you can see accruals, milestone changes, time off used, and most importantly, that the Vacation balance will be 825.7 hours on 8/18/2022.