Checkbox for "show completions while typing" is grayed out

I use Komodo IDE 12 for Windows. In the preferences for Code Intelligence under Editing, the option “Show completions while typing” is grayed out and permanently checked, I can’t change it. How can I get access to un-check that option?

Which language are you working in? Code Intel will grey out if the language does not have an available Code intel engine, so that might be reason.

I am coding in php. Thanks for reading my post.