Easy! I made a quick audio guide. You’ll be able to hear 4 different levels of alignment, and play it alongside your own grinder to check.
When listening, imagine all those teeth around the exterior of the burr brushing each other. If it’s misaligned there’ll be one “chirp” per revolution, where one tooth is knocking on the other burr. If the burrs are indeed aligned then there will be more than one tooth hitting the other burr, which will make more of a blended, dense noise. It’s pretty obvious.