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Hi C Pagan, I work almost exclusively with WordPress and I am very familiar with the Yoast SEO plugin. If your theme has the option to hide titles or you do this with some customization this does not remove the titles from the pages and posts themselves but hides them from being visible to humans not bots and search engines. In Yoast you have to manually set the page title in the admin under  settings - general site title. For all pages and posts Yoast will automatically use the page or post title along with the site title  so if your page title is Plumbing and your site title is Plumbing NY your page title will be Plumbing - Plumbing NY by default. You must manually change your SEO page titles in the meta box underneath the editor on the individual pages or posts to be what you want them to be. Here you can also specify your focus keyword and the pages description. See image for the meta box yq3d9aT