You can run a Profit and Loss report to view a list of accounts associated with transactions marked as disallowable. Then, click the amount on each account to see the list of transactions, Info2172.
Please know that QuickBooks Self-Employed (QBSE) automatically determines whether an expense is allowable based on your tax profile, so you don't have to adjust or classify them manually.
Here's how you can run a report:
Go to Reports.
Click Profit and loss and choose the date you want to run.
Hit View.
Feel free to explore this article to understand better which expenses are considered allowable and which are disallowable: Allowable and disallowable expenses.