This is an accepted solution.
Ash here from the Shopify team. Welcome to the Shopify Community!
When it comes to product settings, the vendor is the manufacturer, wholesaler, or other vendor for the product. Since you're selling the products on your store to your customers, you can be listed as the vendor even if you're dropshipping. With that said, if you'd prefer to list the manufacturer or supplier as the vendor instead, this can be edited in your product settings.
To do this, head over to the Products section of the admin and select a product you want to adjust. Here's a screenshot showing where you can change the vendor associated with a specific product from a product page in the admin:
Additionally, if you're interested in changing the vendor on multiple products at once, a great tool to use is the Bulk Product Editor, which is built into the admin.