The Item Creation Table has certain default fields that will appear when you first open your store. However, some stores require different default fields. For instance, "Item Number" can be added as a default field, or "List on Shopify." If you need to adjust the fields that appear in your Item Creation Table, click the three dot menu in the top right corner and select "Edit Fields."
This will open a popup from the right side of your screen. You can search for the field you would like to add, or you can scroll through the list of options. The dots on the left side allow you to click and drag the fields to adjust the order they appear in as well!
When you're finished customizing the fields, click "Save," and the new setup will be your default Item Creation Table view.