Collection Page Update
Basing this of the Gemini Collection (for example)
Navigate to your theme customizer
Under SHOP in the navigation, click on GEMINI
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It will then bring you to the Gemini collection page.
You will see a section called PRODUCT GRID on the left
You will see a block called PRODUCTS
On the right, you will see these options
Products per row selector is where you can choose how many products display in each row. You can choose 2-8.
That is where you will choose how many products display on each collection template.