Refer to attached file please advise how we can add more products buttons in categories products on last product item we need to add more products button currently showing only 8 products once user click on more product it will go to all product page of selected category please check attach file and please remember its on main landing page.
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About your questions you can set number of product display (Number of Products) like this: https://prnt.sc/t7vqj3
If your product in the category less than setting it will display the number of product in that category.
If you want to show more button to go product category you can use this option (Show Link to Category): https://prnt.sc/t7vrop
Hope this help!