Navigate to Pages > Edit blog page > in the bottom of the page settings check the page title settings for blog page. you can configure the settings for every post in the bottom of the post page. https://ibb.co/Mf4WXX0
Also navigate to Theme Settings > Page title and configure the settings about page title.
Navigate to Theme Settings > Typography > Advanced typography > create a new rule with the “page title” item and customize itt:
Screenshot for clarification: https://ibb.co/GF1Zskg