Version 3.5 of the ShowTime theme contains a bug with the featured images on the home page.  If you're showing just three images, the text is a different size on the third image as shown in the screenshot below:

To fix this, please follow these steps:

  1. In your Shopify dashboard, go to Sales Channels > Online Store > Themes > ShowTime.  Look for the "..." button and choose Edit HTML/CSS.
  2. Navigate to the Snippets directory and open home-ads.liquid.  
  3. Scroll down to approximately line 46 and look for
    <h5>{{ settings.promo_banner_3_heading }}</h5>
  4. Replace the instances of h5 with h2, so it looks like this
    <h2>{{ settings.promo_banner_3_heading }}</h2>
  5. Save the file and that should do it.