I have the + and - icons turned on in the plugin settings. I have tried applying them in the syntax with 'icon="true”' and 'icons="true”', but neither way works. Using Chrome developer tools, I see this in the code, data-rlta-icons=“true”, but still no opener icons. What am I missing?

It's on a development site. We are using it on many pages. Here's an example. dev.hishealinglight.org/healing-journey/students

Ah, okay. That makes a difference. Thank you!