If you want to set the same name for other pages as for the top page in Shopify, you need to edit the "Store Name" from "Settings > Store Details"

The "Homepage Title" can be set in the admin panel's "Online Store > Various Settings" but it is an item for the top page. It depends on the structure of the theme, but for example, if you want to give other pages the same name as the top page in "Dawn", you need to edit the "Store Name" from "Settings > Store Details".