Quiz Questions Glitchy at 1920x1080 Slide Size

Unfortunately, there are limited button-style options for the standard graded-question slides. In other words, there's no quick fix to make them bigger. The entire response, including the text, is selectable, so size doesn't really impact that. But, yeah, the tiny buttons do look silly next to larger text. 

There are a couple of options you could try:

• Use the Freeform function to design custom question slides.
  • More info: Convert Slides to Freeform Interactions in Storyline 360 - E-Learning Heroes (articulate.com) 
• Edit the responses on the standard question slides by inserting a larger circle over the existing button area. Reformat the circle as desired for each state. You'll also want to adjust the margins for the response, so the text won't be too close to the button. 
  
  • Obviously, this is tedious. So I suggest you create one with minimal text, and then duplicate it as needed.
  • More info: TIP: Create Custom Checkboxes and Radio Buttons - Articulate Storyline Discussions - E-Learning Heroes