Quick answer
Your Calendar home shows Days remaining, Days taken and your Annual allowance at the top. The figures update as your leave is approved.
Find it under
Open your Calendar
Tap Calendar in the bottom bar. The banner shows your Days remaining, Days taken and total Annual allowance.
What counts
Only approved leave reduces your remaining days. Bank holidays and non-working days are never deducted. If a figure looks wrong, ask your admin, who sets allowances.