Number of related products to show.
Related products are products from your store that share the same tags or categories as the current product. These products cannot be specified in the admin, but can be influenced by grouping similar products in the same category or by using the same tags.
Related products columns
How many related products to put in a row.
You can specify the sidebar layout for all your produts (none, left, right).
You can adjust the settings from product edit view to have a unique layout for each of your products.