Google and some other search engines decide on an individual website basis whether or not to display the page title and description you have provided.
They will often create and display their own rendition based on the textual content of the page. You can only influence the search engines, but you cannot force search engines to display your SEO page title nor the SEO description. Non-the-less you should not ignore the SEO title and SEO description. You should still fill in these fields, as search engines interpret that these posts are more thorough and of higher value as a result.
And while you are at it don’t forget to choose keyword appropriate ‘Categories” and ‘Tags’ and fill in the ‘Excerpt’ field for each post.
For years Google used a system called “Page Rank”. Each website page was assigned a number from 0 to 10, with 10 as the highest. It even used a “Sand Box” ranking for websites below zero. These were websites that Google penalized in search engine ranking results due to inappropriate content or “Black Hat” SEO methods. The most important page on your website was the “index” (home) page. Search engine optimization specialists focused first on raising their clients’ Page Rank (PR) for the index page and then sub-pages. The higher your PR number was the higher up your pages/site would appear in appropriate Search Engine Results Pages (SERPS).