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.