The central control panel has four buttons. Pressing a button opens up a selection of symbols. You would need to get all four symbols right.
This is the low-spoiler guide for "Central pontrol panel" puzzle in Gibbous - A Cthulhu Adventure. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.