To add a new question, select the accordion layer and click “edit”. From here, you can add more questions using the “+ item” button.
The accordion title is wrapped in a parent container, so you select the parent container and navigate to the “child layouts” section in the styles tab. From here, change the layout from “column” to “row”. Now, you can add a plus sign or dropdown arrow next to the title. From here, you can use the data tab to a make the arrow rotate when clicked (you can learn more about using the data tab here).