Shopify adds your store name in the page title which is not necessary because you’ve already set your page title for SEO, Right? It’s important that you set all your page titles correctly for Search Engine Optimisation.
To remove your store name from your page title in Shopify –
Log in as a store admin
Click and expand Online Store
Click Themes
Click Actions for a drop-down menu then click Edit code
Find theme.liquid under Layout
Find
At the end of the line which contains {{ page_title }}
Remove {% unless page_title contains shop.name %} – {{ shop.name }}{% endunless %}
Click Save