XF 1.5 Screen Width

My brand-new vanilla installation doesn't look that great on my iPhone 6. I have all this dead space that makes my text super small.

image.png

The xenForo forum looks much better:

image.png

What can I change to make mine look like xenForo? Is it an add-on?
 
Thanks for your reply. I did have responsive design enabled, but I needed to change "width" to "max-width" in Style Properties: General: Page Width Controller.

Works great now!
 
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