How can I manage my sold-out variants in a way to be deselect able?

To manage your sold-out variants of a product to be deselect able please follow these steps:

On your Shopify admin panel, go to the "Setting" tab.

Then, click on "Inventory Track" tab.

Activate the "Track Inventory" checkbox.

Choose "Don't display unavailable bundles" from the options.

Then "Save" the changes.

!!! Note: Please pay attention that if all the variants of your product are sold out, a sold-out badge will displays on your bundle. But if some variants of the product are sold-out, the variants wont be selectable on the variant selector of the bundle.