Orders marked with 'A' it's a duplicate of order with bundle. It means that you most likely use bundle type 'As one product in the cart' (all bundled items in one box), and to operate such orders in the Shopify backend and make the inventory system seamlessly deduct bundled products, the order creates duplicates itself with products in separate lines and passes it to the inventory system.
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But no worries! It's internal information, it doesn't affect the main flow of orders proceeding.

Unfortunately, this is not possible, since the inventory in this case will not work correctly, and also the widget of such a bundle may have problems with display.

Unfortunately, this label cannot be hidden, as it contains important information for the app to work correctly.

Yes, it's possible. This can be any type of bundle, except for a bundle that provides optional products (here you need to choose which products will be required and which will not).

If the customer removes one of the products, then the discount won’t be applied.

Or you can choose 'As one product in the cart’ type for the bundle with its own product page, so the customer won’t be able to delete products at all.

Due to technical limitations, it is impossible to apply a discount from compare at price to a bundle, rather than from the current price.
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If you need to display a discount on a bundle based on the initial (compare-at-price) price, then you can enable the compare at price in the discounts' selection fields and choose the discount itself so that the final price turns out to be the one you need. For example, if you need a 25% discount from compare-at-price, then you need to calculate what percentage should be applied to the final price so that the widget shows a total of 25% discount.
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Important to know: the discount will be shown in the cart and at checkout exclusively on the final current price and not on compare-at-price.

You can add a product with variants to the bundle, so the customer could choose the variant of the product when buying a bundle Step 3: Adding products or product variants to the bundle.
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Customer can select product variants in bundle widget, so please make sure that widget is enabled for your bundles.

Removing bundled products from the cart is impossible using the bundle with its own product page and a 'One product at the cart' option chosen.

Yes. There is a list of the types of bundles that can properly sell digital (downloadable) products along with the physical products (even in the same bundle). [Read more] https://bundles.crisp.help/en/article/step-5-add-bundles-details-bundle-name-create-image-bundle-display-on-the-cart-page-assigning-to-the-tags-and-collections-607wf7/