When you create a bundle, you generally select specific products on which you want to apply the discount. currently, only the volume discounts allow you to apply the discount on all products in the shop.
If you create such volume discount and want to exclude a few products from the discount, then the best way to do this is to create another volume discount for which you set the priority sequence to 1, the discount percentage to 0% and include only the products you want to exclude from the discount. This will make the app apply the 0% discount on these products and therefore exclude them from the other discounts.