If your store uses variant items, you may wish to display these variant items on the catalog search page alongside the products they belong to.
Enable 'Show Variants And Personalizations' Setting
Navigate to Themes > Edit Theme > Pages > Catalog Search > Advanced Settings and enable the 'Show Variants And Personalizations' setting. You can also enable 'Show Variant Swatches' if you would like swatches to appear.
Locate Catalog Search Page's ProductList Layout Area
The setting alone is not enough for variants to be displayed. You must also add the proper merge codes and layout area onto your page for them to be visible.
Navigate to Themes > Edit Theme > Pages > Catalog Search > HTML Editor
Scroll down until you find the following tag:
<ac:layoutarea id="ProductList"> ... </ac:layoutarea>
Inside of this tag is where you'll paste the following code. Place it where you would like your variant options to appear. Feel free to remove merges you may not want: