Steps
Open the invoice
Go to Invoices and tap on the invoice you want to delete.
Open the actions menu
Tap the floating button ( ⋮ ) in the bottom right corner.
Tap 'Delete'
If it's been sent, it cannot be deleted.
Tips
Only unsent invoices can be deleted.
If the invoice has been sent, you can void it instead.
Deleted invoices are permanently removed and can’t be recovered.