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I know how beneficial it is for your business to batch delete the customer's invoices. However, this option is unavailable in QuickBooks Online (QBO) UK version. This feature is available in the QBO US region.
What we can do is to manually delete them manually from the Invoices page. Just click the Receive payment drop-down under the Actions column. Then, choose the Delete option and tap Yes to confirm. Feel free to visit our Sales and customers page for more insights about managing your sales and customer transactions.
To know any upcoming QuickBooks updates and enhancements, just access these blogs:
The Community will always have your back if you need a hand with running your business in QBO. I'm always here to ensure your success. Take care always.