i.am.retailer allows you to set how many products to display on a single page of a category when clicking on any category. Follow this step-by-step instruction to set the default number of items displayed on a page.
Step 1: Log in to your admin panel. Choose "Extensions" from the sidebar of your dashboard
Step 2: Choose the "Extensions" option within Extensions.
Step 3: Click on the down arrow to select drop-down menu. Choose "Themes" from the drop-down options.
Step 4: Click on the pencil button to "edit".
Step 5: Choose how many products can be shown on a single page.
Step 6: Click the "Save" button to save your themes page. Upon saving successfully you will get a success message (Refer to screenshot), otherwise, it will show an error message.
Step 6: Open your store, you can view categories (ex: "organic vegetables") and it will show 70 items in a page, as you have set it as 70 in "default items per page".
Step 7: Congrats!! Now you can view all products on a single page.