How to Enable Single Selection for Product Variants
Go to the Backend: Log into the ABACUS backend system.
Navigate to Products: Go to Products > Product Variants.
Edit Product Variant: Click the pencil icon next to the product variant you want to configure.
Tick "Single Selection": Enable this option to limit the customer’s choice to one variant.
When this is enabled, if the customer selects a new variant (e.g., "Large" size), the previously selected variant (e.g., "Small") will be deselected.