I can't disable hard word wrapping when formatting Smarty template file in PhpStorm 2018.3.
I have changed "Hard wrap at" setting to 500 in Settings->Editor->Code Style->PHP
and to 1000 in Settings->Editor->Code Style->HTML
but it wrap lines again when formatting.
Adjust the value of hard wrap at File | Settings | Editor | Code Style. Smarty doesn't have its own settings for Hard Wrap: it takes it from "General" config section.