If you encounter issues while working with the IDEA plugin, please report them to Jira in PFAUT project. Partners or customers can raise a ticket to the Support portal. If possible, add a screenshot or attach the IDEA log file to the message. The log file is located at Help > Show Log in Files/Explorer/Finder; idea.log is the current log file.
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Why Auto-completion Is Not Working?
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Code Reference Info:
https://www.jetbrains.com/help/idea/viewing-reference-information.html
Try Installing an older version of IntelliJ IDEA
Pricefx studio has been known to have some issues with IntelliJ 2021.3, so try installing 2021.2 or another version and see if that fixes your issue.
Older versions:
https://www.jetbrains.com/idea/download/other.html