Hello,

1. You can hide the showing attributes in the product grid in the Theme Settings > Single Product > Elements.

2. Please check this manual: https://xtemos.com/docs-topic/variable-products-and-swatches/

3. You can remove the stock message in the product settings or Woocommerce > Settings > Products > Inventory.

4. By default, Woocommerce does not provide the option, you will need to find a plugin for the purpose.

Best Regards