Evening, is there a way to see which invoices were paid by cheque without searching through them individually?

You can run the Invoices and Received Payments report, kellysage458.

Then, add a column for Payment Method to easily identify which payments were made via cheque. Here's how:

1. Go to the Reports menu and look for Invoices and Received Payments.
2. Click Customise.
3. Click Rows/Columns, then check the box for Payment Method.
4. Click Run Report.

Check out this article to get more details about customising and running reports in QBO:

• Customise your reports in QuickBooks Online
• Memorise reports 

I'll be around if you need more help when looking for additional details about your customer payments.