Ella Theme - if Size variant not available in that particluar collections page hide the product car

[Sravyapuvati]

Hi, 

In Ella theme - If I open collection page suppose 6-12M page if the  size variant 6-12M is out of stock that  particular product should not be visible to the user in that collection page. Can anyone please help.
Website: Mommieskids.com

[Dainal12]

To ensure that out-of-stock size variants, such as 6-12M, do not appear on the collection page in the Ella theme, please modify the theme settings or implement a code adjustment to exclude those products from display.

[SIF123456]

Could you please explain what code needs to be added to the theme?