Page Settings Not Over Writing Theme Settings

I thought on the pages/posts if we selected the options from the page/post that they would automagically override theme settings. Is there a theme setting we have to trigger to allow that to happen? I am changing some settings on a blog post because the font is too cool grey to really read well. Thoughts?

https://www.tbgmarketing.net/database-marketing/2017/05/15/enterprise-data-warehouses-are-you-winning-or-losing/

I was selecting the Post Title from settings below and a Subheading and neither are showing and the font color was also not applied.

Hope you all are well – I love this Theme!