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Hi there, @precisepool!
The number of customers displayed on your list depends on the settings you've selected from the Small Gear icon. Let's customize it to see all the names of your customers.
Lastly, here's a few articles you can read for ideas about how you can manage your customers and sales transactions: Income and expenses for QuickBooks Online.
If there's anything else that I can help you with, let me know in the comments always around ready to help.