Hi forty
Do you mean the color field in this filter? https://ja-megafilter.demo.joomlart.com/index.php/joomla-custom-fields-filter#sort=name&sortdir=asc
It's a custom field called 'Color' and when you assign this custom field to a category, in the settings of each article in this category, you can define a color for it. And that color will appear in the filter.
But make sure that after you define color, you should go to JA Megafilter component and Index that filter and clear caches.
Regards
