Hello there, abdul4.
The Accounting Method doesn't have any bearing on the transactions and whether the books are closed or not. It only has an effect on the reports. For example, in an Accrual method, all unpaid invoices will be reported as income on your P&L, regardless of the report date. However, in a Cash method, they will only reflect in the P&L on the day they are paid, and whether the books are closed or not.
You can refer to this article about cash and accrual accounting methods in reports.
Let me know if you have more clarifications by leaving a comment below. Stay safe!