You can use the rollback feature to remove invoices from Xero. The help article linked here provides further information on how to do that.
However if you need to void an invoice or bill in Xero, then the instructions on how to do that are blow.
In the invoice or bill on Xero, select Void from the Invoice Options menu.
If your entry does not show the Void option in the menu then you must first remove the payment assigned to it.
On the invoice or bill scroll to the bottom and locate the payment and click the payment link:
On the payment screen, select Remove & Redo from the Options menu:
Once you have removed the payment you will be able to void the invoice.
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