Product name then Shop name in the title of Product / Category page

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My home page of my site currently has keyword first, then shop name in the title, but category and product page which required to manually entered my shop name in the title of product page.

It's a little bit troublesome to add my shop name every time I post a product, anyone can tell me where can I add my shop name in the title of product page so I don't need to add it in SEO section every time??


Thanks.