Show more or less Related Items on Product pages

You can adjust the number of related items to show with this modification:

1

Open product-related-items.liquid file

Open your Code Editor. 

From your list of themes, find the Actions link for the theme you'd like to edit. Then select Edit code. Example draft theme:

Example if you're working from your main live/published theme:

Quick link if the theme is live/published:
Open Code Editor

In the Snippets folder, open product-related-items.liquid. 

If Pipeline is published, you can use this quick link:

Quick link if the theme is live/published:
snippets/product-related-items

2

Change the break_at value

In the code area, use the Find feature (Command-F on Mac, Control-F in Windows) and search for the number "6" without quotes:

Change the value on this line, it's usually around Line 53:

The default is 6, change to 4 would show four items. For larger sized images, try 3 or even 2.

Show more than 6 related items?

If you want to show multiple rows, try a larger number like 12:

You can control how many per row with the value on this line:

In that case, if you have 12 and 4 per row, you'll have 3 rows of related items. Change that to value to 6 if you want to show 2 rows of 6 related items. 

Remember to Save the file after your changes.