The variant selectors (color, size, etc.) that appear inside your bundle offers cannot be turned off through a bundler setting. They are displayed automatically based on whether the product has variants set up in Shopify.
How to hide variant selectors
If you don't want variant selectors to appear in your bundle offers, remove the variants from the product itself in your Shopify admin. When a product has no variants, the variant selectors are automatically hidden from the bundle widget.
To manage your product variants, go to Products in your Shopify admin, select the product, and edit or remove its variants under the Variants section. For more details, see Shopify's guide on editing product variants.
⚠️ Removing variants from a product affects your entire store, not just the bundler. Customers will no longer be able to select options like size or color on the product page. Only do this if the product genuinely doesn't need variants.