[Theme: Social Magazine] Manually set when 'Continue reading' is shown

Hi, I’ve just started using this theme and I love it. The only thing I can’t figure out is how to set when the ‘Continue reading’ button is shown on the front page.

I’m guessing that there’s a maximum character count somewhere, but I can’t see where to adjust it or which tag to use to force the button to appear where I want it to – like the more tag does, for example.

Thanks for any help.