I'll shed a light on this matter, wsenti0.
QuickBooks Desktop allows you to either give a lump sum at the beginning of the year or paid time off accruals (sick and vacation time) that can be used when paying employees.
Based on your screenshot, your set up is right. Please know that in QuickBooks Desktop, the accrued vacation or sick hours is a non-posting transaction. This means that even though we can view the total accrued hours when we create the paychecks, these hours won't be posted to the expense account (Payroll Expense) that you've created. We will see 0 on that account until the accrued hours are used by your employees.
This is how QuickBooks handles sick and vacation accruals, accruing these hours will not be posted on your reports or expense account. It will only show once it's used.
We'll also have to take note that Sick and Vacation hours used are based on the pay period end date of the paycheck, and not the paycheck date. In addition, Sick and Vacation hours available as of date will update to the most recent paycheck pay period end date for the employee.
I've included articles that will help you in handling sick and vacation time:
Should you have any other concerns or further questions regarding this matter, you can always find me here. Stay safe and healthy.
