I'm here to help you with adding a new expense category in QuickBooks Online (QBO).
You can follow the steps provided by JenoP above to add a new expense account in QBO. However, you shouldn't be clicking the drop-down arrow but tap on the New tab itself. I've added these screenshots as your visual reference.
If you have any other follow-up questions about adding an expense account to QuickBooks, let me know by leaving a comment below. I'm always here to help. Have a good one!
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